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...".

Is this really the kind of pure scientific expertise - unclouded by any ideological or political concerns - that we want to be making the critical decisions about how to regulate tobacco products which are killing hundreds of thousands of Americans each year?

For example, let's take a look at the ingredient list for some of the major e-cigarette brands on the market:

• I also lied to you when I told you that my own study demonstrated that electronic cigarettes are "a new route to smoking addiction for adolescents." The study was a cross-sectional one, so I could not draw that conclusion. And I admitted it in the article itself. But that's not what I told you.

Lisa Middleton

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