Perceived relative harm of electronic cigarettes over time and impact on subsequent use. A survey with 1-year and 2-year follow-ups

Highlights • A cohort of smokers and ex-smokers was followed over a period of two years. • Perceived harm of electronic cigarettes relative to cigarettes increased over time. • Smoking cessation ande-cigarette use predicted subsequent perceived relative harm. • Perceived relative harm predicted subs...

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