Sadly, the answer is:

In order to draw the conclusion that Dr. Glantz drew in his comment, one would have to completely ignore this study. Obviously, Dr. Glantz has done exactly that. He has based his comment on one narrow study and ignored the rest of the literature.

Moreover, the users of e-cigarettes in the population were likely more addicted to nicotine, making the comparison of their quit rates with those of other smokers inappropriate.

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