Marijuana use by U.S. teens has jumped 10-fold since 1990s

6/20/19–A study looked at 1991-2017 U.S. federal health data on more than 200,000 high school students. It found that the number who said they’d used pot at least once over the past month rose 10-fold — from 0.6% in 1991 to 6.3% by 2017. Many are becoming “dual users” of both marijuana and alcohol: The number of teens who admit to using both substances at least once a month has almost doubled — from 3.6% in 1991 to 7.6% in 2017. Read