This year marks the lowest rates of illicit drug use, including prescription opioids.
A notable exception to this trend is marijuana use.
"We are especially concerned, because the survey shows that some of the teens using these devices are first-time nicotine users", Volkow said. Miech and his colleagues also found that high school seniors from states with medical marijuana laws were more likely to have vaped marijuana and consumed marijuana edibles than those in states that had more restrictive laws.
The survey also noted that while cigarette use continued to decline, almost one in three 12th-graders had vaped over the past year.
This year's edition of the Monitoring the Future report, an annual survey of drug and alcohol use and attitudes among American eighth-, 10th- and 12th-graders, found that the percentage of students who had used pot in the previous year increased to 24%, up 1.3% from 2016. Funded by the National Institute on Drug Abuse, the study has been tracking the use of cigarettes, alcohol, drugs and other illicit substances by eighth-, 10th- and 12th-graders since 1975. It found that teenagers' consumption of most substances - including alcohol, tobacco, prescription opioids and stimulants - has either fallen or held steady at last year's levels, the lowest rates in 20 years.
Overall, past-year use of marijuana increased by 1.3 percent.
A smoker is engulfed by vapours as he smokes an electronic vaping machine during lunch time in central London on August 9, 2017.
Marijuana usenationallyamong adolescents edged upward in 2017, the first significant increase in seven years, according to a study released this week.
Almost one in four teenagers have used marijuana in the past year, and almost a third have vaped before senior year, according to a new survey by the University of MI.
For high school seniors, almost one in three had used a vaping device in the a year ago - with half saying that it had only contained flavouring.
Miech agreed: "There is considerable concern that vaping can led to use of cigarettes". He added that these figures may underestimate the number of students who vaped nicotine, since the drug may have been present in other vaping liquids without teens realizing it.
Both studies found dwindling use of cigarettes. That's slightly less than the 7 percent the study logged one year earlier.
Use of snus - a moist, powdered form of smokeless tobacco - fell for all three grades combined, with 2.6 percent of surveyed students saying they had used it in the past year.
The researchers reported that 5.4 percent of all surveyed students said they smoked flavored little cigars in the previous month, and 3.7 percent said they'd smoked regular little cigars during the same period.
NIDA's survey also shows that though binge drinking continues to decline, it appears to have leveled off this past year.
Illicit drugs have become less popular across the board.
Crystal meth was used by 0.8 percent of high school seniors, the only age group asked about this use.