The incidence of vaping among U.S teenagers has nearly doubled in the past year to more than one in five high school seniors, finds research in the New England Journal of Medicine. The researchers analyzed data from more than 13,000 participants in the “Monitoring the Future” study. Among 12th graders, the proportion who had vaped at least once in the past month jumped from 11 percent in 2017 to 20.9 percent in 2018. Among 10th graders, the proportion grew from 3.5 percent to 6.1 percent. The researchers say it is the largest one-year increase for teenagers using any substance in the 44 years that the study has been conducted. (Monitor on Psychology)

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