So the key argument against electronic cigarettes is that for every person who they help by getting them off of cigarettes, there is another person who they prevent from getting off cigarettes.

In other words, this is a special exemption put in place for what are clearly political, rather than public health purposes.

There are some specific problems with survey studies that could lead to an overestimation of the benefits of electronic cigarettes. One major problem is that a survey study of the use of advanced vapor products would result in a severe bias towards finding a high level of effectiveness of these products. The reason? By the time smokers advance to use products like open-ended systems, they have already experienced success, fulfillment, and enjoyment with vaping. In other words, limiting the sample to users of advanced vapor products filters out the majority of e-cigarette users, who do not experience great success and therefore don't go on to the more advanced products.

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