The major problem with Dr. Glantz's argument is that he is considering only smoking-related mortality. The literature he cites deals with mortality only. However, there is more to life than simply its length. The quality of life is also important (although apparently not for smokers, according to Glantz). And cutting down the amount you smoke substantially improves the quality of life by reducing respiratory morbidity.

Moreover, the ingredients of electronic cigarettes are well known. Even the components of electronic cigarette vapor have been well characterized. In fact, we know a lot more about the components of electronic cigarette vapor than we do about those of cigarette smoke.

One might argue that this is just one errant professor. However, as it acknowledges on its :

Even if e-cigarette vapor shows some toxicity in cell culture studies, how does that demonstrate that vaping is more harmful than smoking?

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