Suppose that there are 1000 e-cigarette users who enter the cancer center with a diagnosis of cancer. Of these, an amazing 900 were able to quit smoking. However, 100 were very resistant smokers and could not quit smoking, even with e-cigarettes. Note that it would be these 100 resistant smokers who would be enrolled in the study. The 900 ex-smokers who quit using e-cigarettes would not be eligible for the study, because they no longer smoke.

Readers should be cautioned that this study should not be used to conclude that e-cigarettes are twice as effective as NRT for smoking cessation generally, for reasons explained articulately by Carl Phillips in his on this study.

While I agree with Stan on virtually every aspect of the regulation of cigarette marketing, we part ways when he advocates the suppression of the truth.

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