a. Classic tobacco

The press release was entitled: "Members of Congress: More and More Children Being Exposed To E-Cigarette Marketing Are Picking Up Habit;FDA Urged to Protect Children as More Evidence Shows E-cigarettes Serve as Gateway to Tobacco Products."

In one of the first studies to examine the trajectory of electronic cigarette use over time, Lechner and colleagues have shown that extended duration of electronic cigarette use is associated with

This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

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