US teenagers are using marijuana and vaporizers more than they smoke cigarettes, a government study shows, according to the BBC.
Some 15% of high school students said they had used marijuana within the previous 30 days, found the report for the National Institute on Drug Abuse.
And 12.1% of students said they had used a vaping device. But only 5% had smoked cigarettes.
One in 10 high school seniors said he or she had vaped marijuana at least once in the past year.
"It's much higher than I expected," said Richard Miech, the University of Michigan researcher who led the study, of the cannabis vaping figure.