"If smoking cessation products can achieve a greater acceptance among smokers by offering craving relief, coupled with rapid absorption and mimicking many aspects of a cigarette ... they will enable a greater proportion of the smoking population to begin their journey towards quitting or substitution of cigarettes with medicinal nicotine products."

In a move that sounds more like a headline in the than an act of a federal health protection agency, the FDA has that it is going to protect the public from the dangers of "defective" cigarettes.

To understand how ridiculous Dr. Glantz's extrapolation is, consider some of the other exposures that also cause reductions in exhaled nitric oxide:

But other health academics have disagreed and have written to the World Health Organisation describing e-cigarettes as potentially life-saving.

Here, they find a correlation between e-cigarette use and higher and more sustained levels of smoking. But because this is a cross-sectional study, they cannot determine which came first. In other words, what is the direction of the causal relationship? Does the e-cigarette use precede, and cause, the smoking? Or does the smoking precede, and cause, the e-cigarette use?

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