You can see the quality of the scientific reasoning we are dealing with.

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.

A new published online ahead of print in the journal Addiction provides evidence that electronic cigarettes may have the potential to outperform nicotine replacement therapy (NRT) for self-assisted smoking cessation.

Curiously, however, this knowledge doesn't stop Glantz from using these studies to draw a conclusion about the efficacy of e-cigarettes as smoking cessation aids in his review article. Moreover, his review article omits any mention of the fact that these 5 studies "did not measure whether people were using e-cigarettes as a smoking cessation aid" and that these studies "did not directly test the efficacy of e-cigarettes as smoking cessation aids."

The reference which supports this assertion is a by Dutra and Glantz which purports to provide data showing that electronic cigarettes are "aggravating the tobacco epidemic among youth."

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