If "they are not harmless" is the worst that opponents can say about electronic cigarettes in 2014, then there doesn't seem to be much of a controversy over whether these products are much safer alternatives to smoking. Likewise, there doesn't appear to be much of a controversy over whether switching to e-cigarettes is a wise choice for smokers who want to quit but feel unable to do so cold turkey (which is, of course, the best option).
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