Disclosure: I have not received any funding or compensation from the tobacco, electronic cigarette, or pharmaceutical industries. However, I am seeking funding from several electronic cigarette companies to conduct a behavioral study on the effects of electronic cigarettes on smoking behavior.

This argument is fallacious, I believe, because there are many things that changed from one cohort to the next. The introduction of cigarette filters is only one such change. To assume that any observed changes in cancer risk from one cohort to the next must be attributable to one particular change - the filter - is not appropriate, in my view.

As I found out when I simply proposed the rather benign, but crucial to science, idea of conducting a clinical trial to examine the effects of electronic cigarettes on smoking behavior (in comparison to the nicotine patch, a well-accepted standard), there is very little room for balanced, objective thinking in the current tobacco control/harm reduction environment. The simple proposal to conduct such a crucial study brought out personal attacks and profound criticism. This despite the fact that every single electronic cigarette company representative I talked to about the proposal felt that the study was critical and needs to be conducted. There was no opposition to conducting sound science among the electronic cigarette companies. All the opposition came from the harm reduction "community."

"Do not listen to what the CDC and the FDA are telling you. There is no question that by quitting smoking, you have greatly improved your health. There is no question that vaping is much safer than smoking. Do not allow yourself to be deceived by the propaganda. Do not return to cigarette smoking in fear that somehow there are hidden risks in vaping that could render them just as dangerous as cigarettes."

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