In a separate published in the same issue of Circulation, these same authors write: "As of March 2014, 5 population-based studies had examined the relationship between e-cigarette use and quitting smoking. Because these studies did not measure whether people were using e-cigarettes as a smoking cessation aid or other reasons for use such as to circumvent smoke-free laws, they did not directly test the efficacy of e-cigarettes as smoking cessation aids." [emphasis is mine]

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