"The vast majority of people who smoke them now also smoke conventional cigarettes, he [Stan Glantz] said, and there is little evidence that much switching is happening. E-cigarettes may even prolong the habit, he said, by offering a dose of nicotine at times when getting one from a traditional cigarette is inconvenient or illegal."

This is an ironic reversal from the past, where it was the public health groups sending the anti-smoking messages and the tobacco industry which was undermining those anti-smoking messages.

"I'm sure this will happen and that is not a good thing, it's quite likely, in my view, many of these young people will then transition to cigarettes themselves."

The paper defends its ethical standards by arguing that it "was consistent with Facebook's Data Use Policy, to which all users agree prior to creating an account on Facebook, constituting informed consent for this research."

(2) A description of any reasonably foreseeable risks or discomforts to the subject; …

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