What is so scary to these lung groups about the prospect of so many smokers quitting or cutting down substantially on their smoking? A cynic might say that it would cause these physicians to lose a huge number of patients. That these groups are trying to protect their own payment streams is as rational an explanation for their behavior than any science- or public health-based explanation I can ponder.

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."

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