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Electronic cigarettes: Many questions, limited research

Electronic cigarettes (ECIGs) are booming in popularity, but there's still only limited evidence on their potential health risks, or their advertised benefits in helping people to quit smoking, according to a new article. Also known as "electronic nicotine delivery systems," ECIGs consist of a heating element that turns an "e-liquid" solution into vapor, which the user inhales. The ECIG solutions typically contain nicotine, but not always.
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