Jacob Sullum provides an of the literature on this topic, pointing out that there is very strong data to demonstrate that the flavors are what attract many smokers to try to quit using electronic cigarettes. You have to read his whole column, but to summarize:

While I still disagree with Leon's finding that serving as an expert witness is a relevant conflict because I do not see any relevant financial interest in the absence of the pertinence of a matter to a specific legal contract for hire of an expert, I do agree completely with his decision regarding the pharmaceutical conflicts of interest.

In the article, Joe Keohane writes:

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