Electronic cigarettes fuel another dramatic increase in nicotine use among American teens.

"It took us almost five decades to understand the harmful effects of cigarette smoke, and we still do not know the long-term impact of the use of electronic cigarettes," said Pawan Sharma, principal investigator at the University of Technology in Sydney. . "These devices that heat solid tobacco are relatively new, and it will be decades before we fully understand their effects on human health."

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