You may wonder why I am calling these people - smokers who have quit smoking via electronic cigarettes - anecdotes.

This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

Dr. Glantz is simply wrong. There is abundant evidence which demonstrates that while vaping does cause some degree of respiratory irritation (and probably triggers a bit of inflammation), it is far safer than smoking and has far less of an effect on lung function.

By Stan's logic, we should throw out all the clinical trials upon which the established effectiveness of NRT is based because every one of these trials was designed to assess the efficacy of NRT among smokers who used these drugs with the specific intent to quit. Instead, according to Glantz's logic, we should examine the rate of smoking cessation among everyone who has ever used an NRT product. Doing that would lead to the conclusion that NRT is completely ineffective for smoking cessation.

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