"There is no question that a puff on an e-cigarette is less dangerous than a puff on a conventional cigarette," said Stanton Glantz, a professor of medicine and the director of the Center for Tobacco Control Research and Education at the University of California, San Francisco. (Yes, he actually said that.)
However, this doesn’t mean the devices always represent a safer step down from cigarettes. In fact, one of the most dangerous things about e-cigarettes is that they may keep people smoking conventional cigarettes longer, rather than encourage them to attempt to quit, he said".
He has nothing to back up his statement but his own hot air but when has that ever stopped him?
By the way he has a PhD, he is not a MD, nor a Epidemologist. He usually passes himself as a MD.