1. Main points

This publication reports on trends in drug use across England and Wales for the year ending March 2020. This publication is largely unaffected by the coronavirus (COVID-19) pandemic as it mainly relates to the period prior to the lockdown.

There was no change in overall drug use and Class A drug use in the last year:

  • An estimated 1 in 11 adults aged 16 to 59 years had taken a drug in the last year (9.4%; approximately 3.2 million people); this is the same as the year ending March 2019 but an increase from 8.6% in the year ending March 2010.

  • Around one in five adults aged 16 to 24 years had taken a drug in the last year (21%; approximately 1.3 million people); this was similar to the previous year (20.3%).

  • An estimated 1% of 60- to 74-year-olds had taken a drug in the last year; therefore, the prevalence of last-year drug use in those aged 16 to 74 years (7.6%) was lower than for those aged 16 to 59 years (9.4%).

  • 3.4% of adults aged 16 to 59 years had taken a Class A drug in the last year (approximately 1.1 million people); this was similar to the previous year (3.7%).

  • 7.4% of adults aged 16 to 24 years had taken a Class A drug in the last year (approximately 467,000 people); this was not significantly different from the previous year (8.7%).

  • 2.1% of adults aged 16 to 59 years and 4.3% of adults aged 16 to 24 years were classed as “frequent” drug users (had taken a drug more than once a month in the last year); these are similar to the previous year’s estimates.

There were no changes in last-year drug use for the majority of individual drug types including cannabis, ecstasy, powder cocaine, new psychoactive substances and nitrous oxide. However, there were falls in the use of two low-volume drug types and the proportion of frequent powder cocaine users:

  • Cannabis continues to be the most common drug used in the last year among adults aged 16 to 59 years and 16 to 24 years, 7.8% and 18.7% respectively; this is much larger than the second most prevalent drugs used in the last year, powder cocaine use for 16- to 59-year-olds (2.6%) and nitrous oxide use among 16- to 24-year-olds (8.7%).

  • Amphetamine use in the last year in adults aged 16 to 59 years fell by 42% compared with the previous year (to 109,000 people), continuing the long-term decline since the year ending December 1995.

  • Anabolic steroid use among 16- to 59-year-olds in the last year also fell compared with the previous year from approximately 62,000 to 31,000 people, following a period over the last decade where reported use was relatively flat.

  • Although there was no change in last-year powder cocaine use among adults aged 16 to 59 years compared with the year ending March 2019, the proportion of frequent users fell from 14.4% in year ending March 2019 to 8.7% in year ending March 2020.

Statistician’s comment

Commenting on today’s release, Billy Gazard from the Office for National Statistics Centre for Crime and Justice said:

“Overall drug use continued to remain stable, with around 1 in 11 adults aged 16 to 59 years having taken a drug in the past year. However, there were differences between age groups. Drug use was much more common among younger adults although, again, the proportion of 16- to 24-year-olds taking drugs was similar to the previous year.

“Cannabis continued to be the most commonly used drug, followed by powder cocaine. However, the proportion of users who took powder cocaine more than once a month fell in the year ending March 2020.”

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4. Frequency of drug use in the last year

In the latest year, while 9.4% of adults aged 16 to 59 years had used any drug in the last 12 months, only 2.1% of adults in this age group were frequent users (approximately 712,0001). A frequent user is defined as having taken any drug more than once a month in the last year. This was similar to the previous year but a significant decrease from the year ending March 20152 (3.1%; around 1 million adults1). For young adults aged 16 to 24 years the latest estimate of frequent drug use was twice as high as for adults aged 16 to 59 years at 4.3% (around 271,000 adults1).

However, of the adults aged 16 to 59 years who reported having used any drug in the last year, the majority reported that they had only taken them “once or twice” (50.4%; Figure 5). This was similar for adults aged 16 to 24 years.

There were also variations in the proportion of frequent users for the individual drug types.

As reported in Section 2: Overall trends in drug misuse, cannabis was the most common drug used but it also had a significantly greater proportion of frequent users than powder cocaine or ecstasy. Among adults aged 16 to 59 years, around one-third of individuals who used cannabis were frequent users and had used the drug more than once a month in the last year compared with 8.7% of powder cocaine users and 1.9% of ecstasy users. The estimates for 16- to 24-year-olds were similar and can be found in Table 2.02 of the Appendix table.

Although there was no change in the use of powder cocaine in the last year among adults aged 16 to 59 years, the proportion of frequent powder cocaine users fell by 39% compared with the previous year (from 14.4% to 8.7%). There were no significant changes in frequent use for the other drug types. However, the latest estimates were the lowest recorded for all three drug types since the time series first began. This follows a general downward trend in the proportion of frequent users, from 45.5% for cannabis, 18.9% for powder cocaine and 20.4% for ecstasy in the year ending March 2004.

Frequency of drug use in the last year is not a measure of drug dependence. The latest information on drug dependence in England is reported in the Adult Psychiatric Morbidity Survey 2014. 3.1% of adults showed signs of dependence on drugs, including 2.3% who showed signs of dependence on cannabis only and 0.8% with signs of dependence on other drugs.

Further data related to the number of adults receiving treatment for substance misuse and hospital admissions related to drug misuse are available through NHS Digital. The Office for National Statistics (ONS) also published data on Deaths related to poisoning by drug misuse.

For more detailed figures on frequency of drug use see Appendix table – Section 2.

Notes for: Frequency of drug use in the last year

  1. Data on number of “frequent” drug users not shown in Appendix table.

  2. Frequency of drug use was first measured in the CSEW in year ending March 2015.

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5. Personal characteristics

As with findings in previous survey years, for the year ending March 2020, the prevalence of any drug use in the last year was highest amongst 16- to 19-year-olds and 20- to 24-year-olds (21.1% and 21% respectively). The use of any drug in the last year also generally declined by age, for example, use in the oldest age category (55 to 59 years) was much lower than the youngest (16 to 19 years) at 2.8% compared with 21.1% (Figure 7; Appendix table – Table 3.03).

However, for the youngest age groups these latest estimates remained lower than they were in the year ending December 1995, falling from 31.8% for 16- to 19-year-olds and 28.1% for 20- to 24-year-olds.

Any drug use in the last year was also higher among men than women aged 16 to 59 years. One in eight men (11.9%) reported taking any drug in the last year compared with 6.9% of women.

There was a similar pattern by individual drug types (Figure 8), for the year ending March 2020:

  • 9.8% of men reported using cannabis in the last year compared with 5.7% of women
  • men were nearly twice as likely than women to have taken powder cocaine in the last year (3.4% compared with 1.8%)
  • 1.7% of men reported having taken ecstasy in the last year compared with 1.1% of women

The year ending March 2020 Crime Survey for England and Wales (CSEW) also found that the prevalence of any drug use in the last year also varied by a range of other personal characteristics including:

  • full-time students (19.7%) were more likely than any other occupation group to have used any drug in the last year
  • those who were single (17.7%) were more likely to have used a drug in the last year compared with those who were married or in a civil partnership (3.2%)
  • victims of any crime, including fraud (13.2%,) in the last year were more likely to have used any drug compared with people that were not a victim of crime (8.3%)

It is important to note that these demographic factors are not necessarily independently related to drug use and the findings only report on differences between estimates. For example, the relationship between higher drug use and being a student may be driven by age.

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6. Lifestyle factors

As reported in previous years, levels of drug use in the last year increased in line with the frequency of visits to nightclubs. In the year ending March 2020, 42.5% of people who had visited a nightclub at least four times in the last month reported using any drug in the last year, compared with 7.2% of users who had not visited a nightclub in the last month (Appendix table – 3.05).

The Crime Survey for England and Wales (CSEW) also showed that the use of powder cocaine was around 12 times higher among those who had visited a nightclub at least four times in the past month (19.1%) compared with those who had not visited a nightclub in the past month (1.6%).

Use of ecstasy (14.4%) and cannabis (34.3%) were also higher for those who visited a nightclub at least four times in the last month, compared with those who had not been to a nightclub in the last month (0.6% and 5.9% respectively).

There was also a similar picture for adults visiting the pub, where the use of drugs increased in line with the frequency of visits. In the year ending March 2020, 26.3% of adults who had visited a pub or bar at least nine times in the last month had used any drug in the last year. This has decreased compared with the year ending March 2019 (falling from 32%) but remains higher than those who had not visited a pub or bar (5.5%).

The CSEW also provides information on last-year drug use by frequency of alcohol consumption. Figure 10 shows that there were higher proportions of any drug use in the last year among those with more frequent alcohol consumption. Adults aged 16 to 59 years who reported drinking alcohol three or more days per week in the last month were more than twice as likely to have used any drug (14.9%) than those drinking less than once a month (including non-drinkers) (5.1%).

There were similar patterns for the use of individual drug types (see Appendix table – Section 3).

It is important to note that lifestyle factors are not necessarily independently related to higher drug use. For example, the relationship between higher drug use and visiting nightclubs and bars may be driven by age, as younger people are more likely to visit nightclubs or bars.

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7. Household and area characteristics

Drug use also varied by household and area characteristics, such as household income. In the year ending March 2020 the CSEW showed that those with a total household income of less than £10,400 (14.8%) were more likely to have taken any drug in the last year than those living in higher income households (Figure 11). This likely reflects differences in the use of drugs by age with larger prevalence rates among young adults.

There was a similar pattern for cannabis use. Those with a total household income less than £10,400 (13.2%) were more likely to have taken cannabis than people in higher income households. However, there were higher proportions of powder cocaine use in the last year for adults living in households with incomes over £52,000 (3.4%) compared with adults in lower income households (£10,400 to £20,800 (1.9%), £20,800 to £31,200 (2.2%) and £31,200 to 41,600 (1.9%).

The year ending March 2020 CSEW also showed that:

  • private renters (14.9%) were more likely to use any drug than social renters (10.3%) and homeowners (6.3%)
  • use of any drug was higher among those living in urban areas (9.6%) compared with those living in rural areas (8%)
  • those living in areas classified as “Cosmopolitans” were more likely to have used any drug in the last year (20.7%) compared with other area types, such as “Multicultural metropolitans” (7.3%) or “Suburbanites” (7.6%)

These findings only report on the differences between the estimates and are not necessarily independently related to higher drug use. For example, the relationship may be driven by age as younger people are more likely to live in urban areas and be private renters.

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8. Extent of drug use and personal well-being

As in previous years, the Crime Survey for England and Wales (CSEW) also showed that drug use varied by personal well-being. Four measures of personal well-being are used as part of the CSEW and follow the Office for National Statistics (ONS) standardised approach to this aspect of measurement. Further information about well-being measures can be found in the ONS publication Personal well-being in the UK: April 2019 to March 2020.

For the year ending March 2020, the CSEW showed that the prevalence of drug use varied by levels of life satisfaction. Of those who reported low levels of satisfaction with life, 23.3% also reported last-year use of any drug. This was significantly higher than those who reported medium life satisfaction (13.2%), high life satisfaction (11.7%) or very high life satisfaction (4.8%) (Appendix table – Table 3.01, Figure 12).

A similar relationship was observed between drug use and feeling that “things done in your life are worthwhile”. Just over one-third of people (34.5%) who had low levels of this feeling reported using any drug in the last year, compared with 5.8% of those with very high levels.

Of those who were classified as having low levels of happiness, 24.0% reported using any drug in the last year. This was higher than those who reported medium levels of happiness (14.4%), high levels of happiness (9.6%) or very high happiness levels (6.4%). This pattern was similar for individual drugs such as cannabis, powder cocaine and ecstasy.

Any drug use was also higher among those who experienced high levels of anxiety (15.7%) compared with those who had low levels (9.1%).

It is important to note that these findings only report on differences between estimates. We have not reported on the direction of any relationship between variables because of the cross-sectional nature of the data. Therefore, it is equally possible that low life satisfaction could lead to drug use, or that drug use could lead to low life satisfaction or an unknown third variable could cause both low life satisfaction and drug use.

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9. Obtaining drugs

Origin of illegal drugs and new psychoactive substances (NPS) or nitrous oxide

Among adults aged 16 to 59 years, almost half of all illegal drugs were obtained through a friend, neighbour or colleague (45.4%). The next most common source was a known dealer (12.5%), followed by a dealer not known personally (6%) and an acquaintance (5.8%). However, there was also a large proportion, 20.5%, who reported that they didn’t know or didn’t want to answer (Figure 13).

While new psychoactive substances (NPS) or nitrous oxide were also most commonly obtained through a friend, neighbour or colleague (34.5%), a considerable proportion of NPS or nitrous oxide users aged 16 to 59 years (14.8%) reported that they had sourced their NPS or nitrous oxide from shops. This is despite the Psychoactive Substances Act making the sale of NPS (and nitrous oxide for use as an intoxicant) illegal. This is most likely because nitrous oxide is currently still legal to sell for certain purposes1.

Perceived ease of obtaining illegal drugs and new psychoactive substances (NPS) or nitrous oxide

In the year ending March 2020 around two-fifths (43%) of adults aged 16 to 592 years claimed that it would be very easy or fairly easy for them personally to obtain illegal drugs within 24 hours. Compared with the year ending March 2019, there was an increase in those reporting that they thought it would be fairly easy (22% to 25%).

Similarly, there was also a small increase in those reporting that they thought it was very easy to obtain NPS or nitrous oxide within 24 hours (9% to 10%).

The perceived ease of obtaining illegal drugs also varied by age. Over half of adults (59%) aged 16 to 19 years thought that it would be very or fairly easy for them to personally obtain illegal drugs within 24 hours compared with 35% of those aged 55 to 59 years. This likely reflects variation in the prevalence of drug use among different age groups (see Appendix table – Table 3.01 and Table 5.02).

Notes for: Obtaining drugs

  1. For example, for medical use by doctors and dentists or as a propellant to whip cream for catering purposes. It is, therefore, possible that users of nitrous oxide who purchased it from a shop did so while claiming this as the intended use. This is discussed in further detail in the Review of the Psychoactive Substances Act, which was published in November 2018.

  2. Questions on perceived ease of obtaining drugs and new psychoactive substances and nitrous oxide are asked to all respondents who completed the self-completion module on drug use, whether they had used a drug or not.

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10. Drug misuse in England and Wales data

Drug misuse in England and Wales - Appendix table
Dataset| Released 9 December 2020
Data from the Crime Survey for England and Wales (CSEW) on the extent and trends of illicit drug use.

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11. Glossary

Any Class A drug

Consists of powder cocaine, crack cocaine, ecstasy, heroin, LSD, magic mushrooms, methadone and methamphetamine.

Any drug

Consists of amphetamines, anabolic steroids, cannabis, powder cocaine, crack cocaine, ecstasy, heroin, ketamine, LSD, magic mushrooms, mephedrone, methadone, methamphetamine, tranquillisers, unknown pills or powders, something unknown smoked and any other drug.

New psychoactive substances (NPS)

Since year ending March 2015, the questionnaire has asked about the use of generic, rather than specific, new psychoactive substances (NPS), sometimes referred to as “legal highs”. These substances are usually intended to mimic the effects of “traditional” drugs such as cannabis, ecstasy, or cocaine. These substances can come in different forms such as herbal mixtures that are smoked, powders, crystals, tablets or liquids.

Frequent drug user

A drug user is defined as frequent if they have taken the drug more than once a month in the last year.

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12. Measuring the data

Crime Survey for England and Wales (CSEW)

Drug misuse data included in this release are sourced from the Crime Survey for England and Wales (CSEW). The User guide to crime statistics for England and Wales provides detailed information about the crime survey.

The CSEW covers the population living in households in England and Wales; it does not cover the population living in group residences (for example, care homes or student halls of residence) or other institutions.

Estimates used within this publication are based on the CSEW self-completion module on drug misuse. The upper age limit for respondents eligible for the self-completion module was increased from 59 years to 74 years in April 2017. This publication reports primarily on those aged 16 to 59 years, for which we have a long-term data series. Only estimates for overall drug use for 60- to 74-year-olds have been included in this publication because of the low prevalence of drug use in this population. Data for both age groups are provided separately within the Appendix table - Table 1.13.

As a result of the coronavirus (COVID-19) pandemic, fieldwork for the CSEW year to March 2020 was suspended two weeks early on Tuesday 17 March 2020 just prior to the lockdown restrictions being announced by the government on 23 March 2020. Estimates for the year to March presented in this publication are therefore largely unaffected by the lockdown restrictions.

The responsibility of this publication has been transferred from the Home Office to the Office for National Statistics (ONS) for the year ending March 2020. Previous publications can be found on the Home Office Drug misuse statistics website.

Interpreting estimates and trends

While CSEW estimates are based on a large sample of the population, it should be recognised that levels of drug use are relatively low. While figures and comparisons published in the release are considered to be robust, changes need to be interpreted with care and consideration.

The use of some drugs are particularly rare and only have a low number of users, for example, heroin use. The range of variability for these drugs will be quite large because of sampling variability; figures will be liable to fluctuation from year to year. Changes from one year to the next should be interpreted with caution and greater attention paid to the medium and longer-term trends.

Statistical conventions

Only increases or decreases that are statistically significant at the 5% level are described as changes within the main bulletin, and in the tables, these are identified by asterisks.

Revisions to CSEW time series

Following the 2011 Census, the Office for National Statistics (ONS) re-weighted the CSEW data from the year ending March 2002 to the year ending March 2013 surveys using the most recent population estimates. The new population weights were applied to estimates of drug use among 16- to 59-year-olds, and these revised estimates were published in the year ending March 2014 release. For more detail on the re-weighting of CSEW data, please see the ONS methodological note Presentational and methodological improvements to National Statistics on the Crime Survey for England and Wales (PDF, 176KB).

Between the year ending March 2002 and year ending March 2009, the surveys included a boost sample of young adults in order to improve the accuracy of drug use estimates among 16- to 24-year-olds. For the year ending March 2002 to year ending March 2006, the youth boost weights could not be reproduced in line with the 2011 Census population estimate. Therefore, the estimates of drug use among 16- to 24-year-olds for these years are not based on the re-weighted data. The youth boost sample does not affect estimates of drug use among adults aged 16 to 59 years, as these are based on the core sample only.

The methodology for estimating numbers of drug users was subsequently improved, to account for the fact that respondents to the CSEW self-completion module on drug use are a sub-sample of the whole target population. Only those aged 16 to 59 years were asked to complete this module, and some may refuse to do so, with 60- to 74-year-olds asked to complete the module since the year ending March 2018 survey. This further detail was taken into account when dealing with non-response to produce more accurate estimates and led to a further revision of the estimated numbers of drug users in the Drug misuse year ending 2015 release.

In 2016, the ONS announced a methodological change to the handling of repeat victimisation in the CSEW. This resulted in a small change to the weighting procedure for all historical datasets1. Estimates have only been re-calculated using the new weights in this publication and the Drug misuse: findings from the 2018 to 2019 CSEW where comparisons between survey years have been made. From the 2018 to 2019 release onwards, data for the years where the estimates have been re-calculated differ to data contained in previous publications.

There are two exceptions to this:

  • For year ending March 2009, data relating to 16-to 24-year-olds; the datasets containing the revised weights for the youth boost are not currently available and therefore the original estimates have been used in this publication.
  • For new psychoactive substances and nitrous oxide, estimates have been re-calculated for all years with the new weights and updated population estimates; therefore, these estimates are not comparable with other drug types within those years.

Further information on the crime survey can be found in the CSEW user guide.

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13. Strengths and limitations

The Crime Survey for England and Wales (CSEW) is recognised as a good measure of recreational drug use for the drug types and population it covers. However, it does not provide as good coverage of problematic drug use, as many such users may not be a part of the household resident population covered by the survey.

The CSEW does not cover some small groups, which are potentially important, given that they may have relatively high rates of drug use. Notably these are the homeless and those living in certain institutions, such as prisons. It also does not cover students living in halls of residence.

Despite the self-completion methodology of the survey, which is intended to encourage honest answers, disclosure issues still exist around willingness to report drug use. An unknown proportion of respondents may not report their behaviour honestly. However, the CSEW provides consistent measures of drug use and comparisons over time remain valid.

As a result of these possible limitations, the CSEW is likely to underestimate the level of drug misuse in England and Wales.

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15. Annex : Classification of drugs

Classification of drugs under the Misuse of Drugs Act 1971

The Misuse of Drugs Act 1971 classifies controlled drugs into three categories (Classes A, B and C), according to the harm that they cause, with Class A drugs considered to be the most harmful. The following table lists the drugs that respondents were asked about in the year ending March 2020 Crime Survey for England and Wales (CSEW) and their current classification under the Misuse of Drugs Act 1971.

Recent changes in drug classifications

Following the Drugs Act 2005, raw magic mushrooms were classified as a Class A drug in July 2005. Prior to this change in the law, only prepared (such as dried or stewed) magic mushrooms were classified as Class A drugs. However, the CSEW does not distinguish between the different preparations of this drug, so the trend in magic mushroom and Class A drug use presented here has not been affected by the change in the law.

If a drug that is ordinarily Class B is prepared for injection, it will be treated as a Class A drug under the Misuse of Drugs Act 1971. Since CSEW questions do not distinguish between the preparations of the drugs taken, Class B drugs are not included in estimates of overall Class A drug use in this report.

The CSEW included a question on methamphetamine (which is classified as Class A) for the first time in year ending March 2009.

Similarly, tranquillisers can either be classified as Class B (such as barbiturates) or Class C (such as benzodiazepines). Consequently, Class B and Class C drugs cannot be aggregated reliably because the survey does not identify which specific tranquilliser respondents used.

Cannabis was reclassified from a Class B to a Class C drug in January 2004. However, the Government decided to reclassify cannabis as a Class B drug under the Misuse of Drugs Act 1971 with effect from January 2009. Reclassification does not affect CSEW estimates, but cannabis is presented as a Class B drug within CSEW reports from the year ending March 2009 publication onwards.

Questions on ketamine were first introduced in the year ending March 2006 survey. Ketamine was reclassified from a Class C to Class B drug under the Misuse of Drugs Act 1971, with effect from June 2014. Reclassification does not affect CSEW estimates, but ketamine is presented as a Class C drug within CSEW reports up to year ending March 2014, and as a Class B drug from the year ending March 2015 publication onwards, reflecting the change in classification during that interview year.

Legislation was passed on 16 April 2010 under the Misuse of Drugs Act 1971 to control mephedrone as a Class B substance. From year ending March 2011 mephedrone was included in the main trend measures for last year use and in the main trend measures for lifetime use since year ending March 2013 (when this question was introduced into the survey).

Legislation was passed in December 2009 to control the substances Spice, BZP and GBL or GHB and other synthetic cannabinoids. Spice is a brand name of, and generic slang for, various herbal mixtures laced with synthetic cannabinoids. BZP (Benzylpiperazine) is a drug with euphoric and stimulant properties with effects similar to those produced by amphetamines. GHB (gamma-Hydroxybutyrate) is an intoxicant and a “date rape drug”, which has been controlled under the Misuse of Drugs Act 1971 as a Class C drug since 2003. GBL (gamma-Butyrolactone) is not active in its own right but is a substance that is converted to GHB by enzymes found in the blood and has a faster onset of effects than GHB itself.

Following a review by the Advisory Council on the Misuse of Drugs, which focused on the medical and social harms of khat consumption, it was announced in July 2013 that the Government would control khat under the Misuse of Drugs Act 1971 as a Class C drug, from 24 June 2014. Questions on khat were included in the year ending March 2011 and 2012 surveys, removed for year ending March 2013 and 2014, re-introduced for the year ending March 2015 and 2016 surveys, and removed for the year ending March 2017, 2018, 2019 and 2020 surveys.

Classification of drugs under the Psychoactive Substances Act 2016

Substances such as mephedrone, Spice, GBL or GHB, salvia and other emerging substances are collectively known as new psychoactive substances (NPS), often previously referred to as “legal highs”. These substances are usually intended to mimic the effects of “traditional” drugs such as cannabis, ecstasy, or cocaine. These substances can come in different forms such as herbal mixtures that are smoked, powders, crystals, tablets or liquids.

NPS is not a perfect term; some of these substances were first synthesised a considerable time ago and are not inherently “new”. However, other descriptions of NPS, such as “legal highs”, are inaccurate, as many NPS have been controlled under the Misuse of Drugs Act 1971.

With limited exemptions (for example, caffeine, tobacco, alcohol) the production, distribution, sale and supply of psychoactive substances not controlled under the Misuse of Drugs Act 1971 or other Acts (for example, the Medicines Act 1968) is now illegal under the Psychoactive Substances Act 2016; these may previously have been legal to buy.

The CSEW first measured the use of generic, rather than specific, NPS in year ending March 2015, prior to the commencement of the Psychoactive Substances Act 2016. Similar to other questions on drug use that include the street names of drugs, the NPS questions included a description using the better-understood term “legal highs”:

“There are a range of substances sometimes called “legal highs” that have the same effects as drugs such as cannabis, ecstasy, or cocaine. These are herbal or synthetic substances that you take to get “high”, which may or may not be illegal to buy. These substances can come in different forms such as herbal mixtures which you smoke, powders, crystals, tablets, or liquids.”

As the Psychoactive Substances Act 2016 was enacted in April 2016, the explanatory wording for NPS in the year ending March 2017 survey was revised to remove the words “which may or may not be illegal to buy”.

It should be noted that many NPS are controlled under the Misuse of Drugs Act 1971 rather than the Psychoactive Substances Act 2016, and there are several non-NPS substances which are controlled under the Psychoactive Substances Act 2016. This means that the estimate of NPS use does not provide a measure of all drugs controlled under the Psychoactive Substances Act 2016. The year ending March 2017, 2018, 2019 and 2020 surveys include a question on the use of nitrous oxide, which is not considered an NPS but is controlled under the Psychoactive Substances Act 2016.

Composite drug use measures based on the Crime Survey for England and Wales

Within Home Office drug misuse publications, composite variables that amalgamate the use of individual drugs are presented; the individual drug use variables that they include are outlined below.

Inclusion of specific variables in composite drug measures

Individual types of drugs that are specifically asked about in the CSEW are presented in all tables of Section 1 in the Appendix table. In addition to these named drugs, respondents are also asked whether they have taken something else in the same time period, that is: pills or powders (not prescribed by a doctor) when the respondent did not know what they were; smoked something (excluding tobacco) when the respondent did not know what it was; and, taken anything else that the respondent knew or thought was a drug (not prescribed by a doctor). These are included in the composite measure of “any drug”, but not presented individually in tables.

Amyl nitrite was included in the yearly any drug measure until year ending March 2017. It was removed in year ending March 2018 as the question on last year use of amyl nitrite was removed from the survey.

Questions on glue use have not been included since the year ending March 2010 CSEW. Analysis of the impact on the “any drug” measure and its trend over time showed that the removal of glue had no overall important impact.

Mephedrone is included in the “any drug” measures, unless stated otherwise. Prior to the year ending March 2015 Drug Misuse bulletin, two versions of these measures had been presented, with and without mephedrone; in past bulletins it had been excluded from these measures in the context of analysis by demographics. In year ending March 2015 the measures excluding mephedrone were removed and the demographics back-series were updated to include mephedrone for all past years in which questions on mephedrone had been asked (from year ending March 2011 onwards for last year use, from year ending March 2013 onwards for use ever in a lifetime, and from year ending March 2015 for last month use).

Because questions on the lifetime use of mephedrone were introduced two years after the questions on last year use, the estimates of last year mephedrone use from the year ending March 2011 and 2012 surveys are different from the other individual drugs included in the survey, as respondents were not previously asked about their experience of ever using mephedrone. It is not possible to identify what, if any, effect the addition of the lifetime use question in year ending March 2013 may have had on the last year estimates of mephedrone use, and indeed on the overall measure of any last year drug use, but any effect would be considered to be very small.

Stimulant substances

In previous publications, a composite group called “Any stimulant drug” was presented, which included drugs across the legal classification that are used for their stimulant properties, and are more likely to be used interchangeably by the same people at similar times and in similar settings. A subset of NPS drugs have stimulant properties, which are also likely to be interchangeable with other stimulant-type drugs. The survey does not identify whether respondents have used NPS which specifically have stimulant properties, so the use of stimulant-type NPS are not estimated. The “Any stimulant drug” composite measure has therefore been removed since the year ending March 2017 publication.

Accounting for concurrent polydrug use when interpreting composite measures

Concurrent polydrug use (use of more than one drug in the last year) is different from simultaneous polydrug use (use of more than one drug on the same occasion, or at the same time). Analyses of simultaneous polydrug use were published in the Drug misuse declared: findings from the 2011 to 2012 Crime Survey for England and Wales (CSEW) and Drug misuse: findings from the 2014 to 2015 CSEW bulletins. Note that caution should be taken in the interpretation of trends in the composite category. Taking Class A drug use as an example, of the people who took Class A drugs in the last year there will be many cases of concurrent polydrug use, that is, cases where people used more than one drug type in the last year (though not necessarily at the same time).

Some people may have taken all of the Class A drugs in the last year, others a combination and some just one. For example, if there is an increase in the use of powder cocaine, there may not necessarily be an increase in the use of Class A drugs overall; this could occur because of users switching from one Class A drug to another. It is only when there is a significant increase in “new” Class A drug users that a change in use of Class A drugs overall will occur. It is also, of course, possible that users of drugs switch between drugs of different classes.

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Contact details for this Article

Nick Stripe
crimestatistics@ons.gov.uk
Telephone: +44 (0)20 7592 8695