Thirdhand smoke is as dangerous as active smoking, according to anti-smoking researchers at the University of California, Riverside.

Dr. Glantz's comments on the lack of health benefit in cutting down on one's smoking come in response to one of the reported benefits of electronic cigarettes: that they help many smokers to cut down substantially on the amount they smoke. Glantz : "Dual users, who simultaneously use both products, are unlikely to see much, if any, health benefit because of the continued cigarette use, even if daily consumption drops." In other words, if you are still smoking, there are no benefits from cutting down on the amount you smoke thanks to e-cigarettes.

The study concludes that "e-cigarette use is aggravating rather than ameliorating the tobacco epidemic among youths."

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