Furthermore, it is well known that electronic cigarette users do not inhale more deeply than smokers. While smoke does enter the distal airways - which is why adenocarcinoma rates have increased so dramatically - vaping involves aerosol inhalation and the aerosol is mostly absorbed in the upper, not the lower airways. As with a nicotine inhaler, most of the nicotine absorption occurs in the upper airways.

For Dr. Glantz's argument to be correct, then it must be the case that there are literally thousands of smokers out there who would have simply quit smoking if only it hadn't been for electronic cigarettes. Readers must recognize two important points about this argument:

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