More U.S. adolescents are vaping cannabis oils, or THC, according to two new reports published in the Journal of the American Medical Association.

The percentage of 12th-graders who reported vaping THC within the past 30 days nearly doubled year over year to 14% in 2019, according to Monitoring the Future, a long-running youth survey conducted by the University of Michigan. That makes it the second-largest jump for any substance in the survey’s 45-year history. The largest jump occurred last year among 12th-graders vaping…

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