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:

C. Three

The paper defends its ethical standards by arguing that it "was consistent with Facebook's Data Use Policy, to which all users agree prior to creating an account on Facebook, constituting informed consent for this research."

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