"The government has an obligation to carefully scrutinize any new consumer product that is presented as an alternative to smoking. But government agencies and public health officials have no business discouraging or disparaging e-cigarettes in the absence of any data that they are causing harm. This is especially the case when these products have so much potential to curb cigarette smoking, the public health scourge that still claims half a million lives a year."

The CDC's response:

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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