The authors of this study make one of the most cardinal errors in all of epidemiology. They ignore the principle that "correlation does not equal causation."

The FDA is essentially saying that ex-smokers who have quit smoking using electronic cigarettes might as well revert back to smoking, since the Agency is not aware that vaping is any less hazardous than smoking. Is this the kind of scientific-based advice that we think is appropriate to be coming from a federal health agency?

This is what we call science in tobacco control today?

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