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.

2. "The wild west marketing of e-cigarettes is not only encouraging youth to smoke them, but also it is promoting regular cigarette smoking among youth."

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Although the survey approach described above would lead to "invalid" results, I would never argue that survey studies should be thrown out and that we should only be conducting RCTs. My point is that there are strengths and limitations of various study designs, and causal inference is enhanced by having research evidence from multiple study designs. On balance, the strengths and weaknesses balance each other out, leading to a much greater ability to draw valid conclusions.

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