A greater share of US teens are vaping nicotine e-cigarettes.
About 25 percent of high school seniors surveyed this year said they vaped nicotine in the previous month, up from about 21 percent the year before.
The University of Michigan study was published online on Wednesday by the New England Journal of Medicine.
Researchers surveyed more than 42,000 students across the country in grades 8, 10 and 12.
The study also found cigarette smoking declined in high school seniors, from about 8 percent to 6 percent.
RELATED: New York state bans flavored e-cigarettes over vaping concerns
The researchers have not reported how many students said they vaped marijuana.
A government survey released last week showed similar trends.
-
New Jersey expected to announce vaping restrictions
Within weeks, New Jersey could become the latest state to restrict e-cigarette use, with the governor on Thursday launching a task force to find ways ... Variety -
Wisconsin man accused of making illegal vaping cartridges
Authorities say a Wisconsin man is accused of manufacturing thousands of counterfeit vaping cartridges a day with THC oil for almost two years. ... Variety -
Third death linked to vaping in United States
A third person has died in the United States as a result of a severe lung illness that has sickened hundreds of e-cigarette users, or vapers, health ... Variety