In an published in the Milwaukee Journal-Sentinel, professor of epidemiology Dr. Ruth Etzel - formerly with the World Health Organization - called for a ban on electronic cigarette advertising. However, she made no similar call for a ban on tobacco cigarette advertising.

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 problem with what Dr. Glantz has done is that he is already disseminating the "answer" to this important research question without having actually done the research. That obviates the need to do the research because it is too late. The answer has already been disseminated, and it is going to affect important public policy as well as clinical decisions.

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