The number of U.S. adult smokers who have tried electronic cigarettes rose from about 10% in 2010 to about 21% in 2011, according to a CDC study released on Thursday. Current smokers were more likely to use the devices than nonsmokers, researchers said. "There is still a lot we don't know about these products, including whether they will decrease or increase use of traditional cigarettes," CDC director Dr. Tom Frieden said.
CDC: 1 in 5 adult smokers have tried e-cigarettes
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