What the study found was that 11.9% of the former smokers had ever tried an electronic cigarette in the past year. This means they might have tried an electronic cigarette once and never taken another puff again. It means they may have tried a single puff on an electronic cigarette just to see what it was like.

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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