There is no excuse for collecting this important information, but not revealing it to the public. The only legitimate justification for this would be if there were no reported conflicts of interest. In such a case, the report could have included a statement indicating that none of the report's authors reported a conflict of interest.

In other words, the blatant flaw in this study is that it enrolled smokers who had already made quit attempts using e-cigarettes in the past. By definition, this resulted in a sample of smokers who were more resistant to quitting. One would expect to find lower quitting rates among this population of e-cigarette users.

To be valid, the study needs to examine e-cigarette smokers who have not tried these products before and are trying them for the first time in an attempt to quit smoking. Otherwise, the study cannot truly claim to draw conclusions about how helpful e-cigarettes are for smoking cessation among cancer patients.

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