The use of electronic cigarettes among middle- and high-school students in the U.S. doubled from 2011 to 2012, CDC researchers reported on Thursday. During the study period, the percentage of middle-school students using e-cigarettes rose from 1.4% to 2.7%, while the rate for high-school students jumped from 4.7% to 10%. "Many teens who start with e-cigarettes may be condemned to struggling with a lifelong addiction to nicotine and conventional cigarettes," CDC Director Tom Frieden said.

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