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nicotine was detected in cartridges labeled as having the same amount, suggesting imperfect quality control in their manufac- ture. Also, tobacco-specific nitrosamines, known human carcinogens, were found in half the samples, and tobacco-specific impurities suspected of being harmful to humans—anabasine, myosmine, and β-nicotyrine—were found in most samples. One sample had diethylene glycol. In a similar study, Maciej Goniewicz, Ph.D., of the Roswell Park Cancer Institute in Buffalo, N.Y., and colleagues analyzed vapors from 12 brands of e-cigarettes for the presence of carcinogens found in tobacco smoke, focusing on four groups: carbonyl compounds, volatile organic com-

More Questions Than Answers Surrounding E-Cigarette Debate