The impact of this confounding is that it will bias the results towards finding that e-cigarettes are much less effective than other approaches. In fact, this is exactly what happened and it is the reason why the evidence that Glantz and others are citing to support their contention that e-cigarettes hinder smoking cessation is invalid.

The Rest of the Story

released yesterday by Action on Smoking and Health (UK) show that although electronic cigarette use is widespread and increasing among youth, it has not resulted in regular use among a substantial proportion of youth and among nonsmokers, there are very few regular users.

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