(See: Zhu S-H, et al. Four hundred sixty brands of e-cigarettes and counting: implications for product regulation. Tobacco Control. Published online ahead of print on June 17, 2014.)

The Michigan Medical Society - representing the state's physicians - is opposed to legislation that would do nothing more or less than ban the sale of electronic cigarettes to minors.

If there were any evidence that electronic cigarettes inhibit, rather than enhance smoking cessation, I too would join Dr. Glantz's camp and oppose electronic cigarettes. But such evidence does not exist. Not a shred of it so far. Not a single study suggests that electronic cigarette use results in lower quit rates than what would occur in the absence of electronic cigarette use among smokers who try these products.

•Ads must not be directed at people under 18 through the selection of media or the context in which they appear

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