Levels are about the same as those found in air.

By Jacob Sollum

Source: Reason.com

Anti-smoking activists and public health officials who question the usefulness of electronic cigarettes in reducing tobacco-related disease often talk as if the content of the aerosol generated by these newfangled contraptions is utterly mysterious. While it may be plausible that the absence of combustion makes e-cigarettes safer than the conventional kind, they say, we can’t know for sure without more information about exactly what vapers are sucking into their lungs. That stance is misleading and disingenuous, since we already have a pretty good idea.

2013 study reported in Tobacco Control, for example, looked at a dozen e-cigarette brands available in Poland and found that “the levels of potentially toxic compounds in e-cigarette vapour are 9–450-fold lower than those in the smoke from conventional cigarettes, and in many cases comparable with the trace amounts…

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