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.

Fortunately, there is a simple way to evaluate this hypothesis, at least on a preliminary basis, prior to waiting for the results of longitudinal studies. Enough youth are experimenting with electronic cigarettes, and the increase in youth e-cigarette use has been dramatic and sustained enough, that if the gateway hypothesis were correct, we would be starting to see an increase in smoking prevalence among youth due to the many new smoking initiates that were converted from e-cigarette experimentation to smoking.

The rest of the story is this study actually found no effect of electronic cigarette use on pulmonary function tests, indicating that there was no clinically significant observable effect of vaping on lung function. Specifically, the study found "no differences between basic pulmonary measurements" between the two groups, demonstrating that acute exposure to electronic cigarette vapor did not affect FEV1, FVC, PEF or MEF50 and MEF75."

The communications director for another national anti-smoking group added: "This just goes to show that the tobacco companies have not changed. They will go to any extent to keep America's children smoking, even paying university scientists to do their dirty work for them."

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