The letter picks up on many of the precise points that I have been arguing during the past few weeks: ; ; .

Perhaps the most useful contribution of this paper is that it readily demonstrates why the approach being used by Stan Glantz to assess the effectiveness of e-cigarettes for smoking cessation is inappropriate and leads to erroneous conclusions.

That the FDA is not sure whether smoking is any more hazardous than vaping does not say a lot for the agency's scientific standards.

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