A school-based survey shows nearly 1 in 11 U.S. students have used marijuana in electronic cigarettes, heightening concern about the new popularity of vaping among teens.
E-cigarettes typically contain nicotine, but results published Monday mean 2.1 million middle and high school students have used them to get high.
The devices are generally considered a less dangerous alternative to regular cigarettes, despite little research on their long-term effects including whether they help smokers quit.
The rise in teenagers using them has alarmed health officials. Last week, the Food and Drug Administration gave the five largest e-cigarette makers 60 days to produce plans to stop underage use of their products.
Nearly 9 percent of students surveyed in 2016 said they used an e-cigarette device with marijuana, according to the report in the journal JAMA Pediatrics. That included one-third of those who ever used e-cigarettes.
More than 20,000 students took the survey.
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