The argument being made by the CDC, as well as many other anti-smoking groups and advocates, is that electronic cigarettes are a gateway to youth smoking. In other words, youth who have never smoked before are going to try electronic cigarettes, become addicted to nicotine, and then move on to tobacco cigarette smoking.

Sabrina Tavernise put together an outstanding, insightful, and very well-written article about the electronic cigarette debate within the tobacco control movement for a front-page Sunday New York Times .

The problem is that in this cross-sectional study, there is no way to determine the direction of the observed relationship.

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