Information on the sample sizes and confidence intervals for this chart can be found in the Excel download table. Information on what confidence intervals are can be found in the background notes.
The term "cigarette smoker" refers to adults aged 18 and over who stated they currently smoke cigarettes. The IHS does not collect information on e-cigarettes.
A set of reference tables are included in this year’s report, which provide the estimates behind this chart at a country level, for the reference period 2010 to 2014. These can be found in the data section of the publication.