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RE: A Small Study On The Health Effects of Electronic Cigarettes
I wonder what were to happen if those individuals were asked to stop Vaping and their biologicals were measured again over time. Perhaps a way to confirm these results (although sample size would remain very little)
In the article the authors discuss that over the course of the study a few of the participants who were in the vaping group stopped all together, and also a few of the control began smoking (vaping). So I believe they would actually have this data, though they did not discuss it in detail. Perhaps because it did not show a difference since there weren't any differences between the test and control groups anyway.
Now things clearly would be different were the authors sampling traditional cigarette smokers.