It is remarkable that despite all of the widespread marketing of electronic cigarettes and the claims that these products represent a safer alternative to smoking, the public is still split down the middle as to whether cigarette smoking is any more hazardous than vaping.

The authors write: "FDA should immediately under the current rulemaking establish a product standard prohibiting flavors in e-cigarettes... ."

Instead, I think that studies which specifically compare lung cancer risk between lifelong smokers of filtered vs. non-filtered cigarettes during the same time period are most informative regarding the relative cancer risks of these products. And multiple studies along these lines, including recent studies, have reported a slightly decreased risk associated with lifetime smoking of filtered vs. non-filtered cigarettes.

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