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This question is not included in the survey every year, but there have been no clear changes in the proportion of adults or adult smokers using shisha since 2017

We found that many of the studies were at high risk of bias this was usually because the e-cigarette users under investigation were also current or previous tobacco smokers (or studies had not checked for this), making it hard to pick out the effects of the e-cigarettes alone the findings should be considered with this in mind