Furthermore, later in the paper they reinforce this point more specifically, writing: "the cross-sectional nature of our study does not allow us to identify whether most youths are initiating smoking with conventional cigarettes and then moving on to (usually dual use of) e-cigarettes or vice versa...".

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.

Unfortunately, there have been numerous violations of this disclosure standard, as several commentators on electronic cigarette policy have failed to disclose their Big Pharma ties in published articles. I have highlighted many of these stories on my blog, but for one demonstrative example, see my on failed disclosures by an individual and an organization in the New York Times debate on electronic cigarettes.

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