In other words, despite acknowledging that they cannot tell from their study whether e-cigarette use precedes smoking or whether smoking precedes e-cigarette use, they nonetheless draw the conclusion that e-cigarette use precedes smoking.

The commentaries by the two former tobacco industry consultants, university professors at a major midwestern medical school, are not in any way pro-tobacco, although they do criticize a number of current anti-smoking initiatives because they are ineffective and not based on sound formative research.

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