According to the Surgeon General's report:

The AHA provided recommendations for policy on the manufacturing, use and distribution of e-cigarettes in their report published on August 25th, 2014. Their policy stresses how they believe we as a society should move forward in the new and ever changing market of electronic nicotine delivery systems. Stressing the absolute importance of more research was one of the objects at the top of their list.

The randomized study provides a number of important benefits that can never be realized in a survey study. Most importantly, the RCT can equalize between study groups the known and unknown confounding variables that may lead to invalid study results.

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