One in four teens who use electronic cigarettes have tried "dripping" liquid nicotine directly onto the heating coils on the devices to get thicker clouds of vapor, a new study suggests. Big U.S.
An exhibitor staff member uses an electronic cigarette at Beijing International Vapor Distribution Alliance Expo (VAPE CHINA EXPO) in Beijing, July 24, 2015. REUTERS/Jason Lee By Lisa Rapaport ...
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