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Using e-cigarettes, often called vaping, has now overtaken smoking traditional cigarettes in popularity among students, says the Centers for Disease Control and Prevention. Last year, one in five U.S. high school students reported vaping the previous month, according to a CDC survey. Compared with regular cigarettes, the research on the health effects of e-cigarettes is painfully thin. Experts say that although using e-cigarettes appears less harmful over the long run than smoking regular cigarettes, that doesn't mean they're safe [...]