Stated another way, Dr. Glantz is cautioning the FDA against assuming that e-cigarettes are safer than conventional cigarettes in terms of their effects on lung function.

These flaws are also noted by Dr. Robert West, director of tobacco research at University College London, who that: "the study was not able to assess whether or not for cancer patients who smoke using an e-cigarette to try and quit is beneficial "because the sample could consist of e-cigarette users who had already failed in a quit attempt, so all those who would have succeeded already would be ruled out"."

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