(CNN) -- Vaping is now second only to alcohol, as the most frequently-used substance by teens. That's according to a new 'Monitoring the Future' report published by the University of Michigan Institute for Social Research.
It says nearly 40% of high school seniors have tried it in the past year with nicotine as the most commonly reported substance used by 12th-graders, followed by flavoring and then marijuana.
Flavoring is the most commonly reported substance used among the eighth-graders.
"In 2018, we saw a dramatic increase in the use of vaping devices by teens in all the different grades," said Dr. Wilson Compton, deputy director of the National Institute on Drug Abuse of the National Institutes of Health. "So we were really quite surprised by how commonly teens were using vaping devices to administer nicotine and other substances."
One positive trend the report did find is that drug and alcohol use among teens is the lowest that it's been in many years, even though alcohol was still "the most frequently used substance" reported.