E-cigarettes are less harmful than regular cigarettes, but they are not harmless, according to a report by the National Academy of Sciences, Engineering & Medicine (NAS), Public Health Consequences of E-Cigarettes. The report acknowledges continuing concerns with the harms associated with e-cigarettes, particularly as they relate to youth, finding an association between the use of e-cigarettes by youth and the eventual use of combustible tobacco cigarettes.
What is not yet known: the long-term risks of continued e-cigarette use over many years.