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A new study adds to mounting evidence that the use of electronic cigarettes (e-cigarettes), or vaping, has increased in recent years among U.S. adults, with nearly 1 in 20 reporting current use of e-cigarettes, according to research [...] "While an increase of 0.5% over three years may not sound like a large increase, that's a lot of [new] e-cigarette users once you extrapolate out to the overall population," said Mahmoud Al Rifai, [...] "Based on our findings, I think the trend is only going to go upward, but we don't know yet what the long-term health effects are."