A steep rise in nicotine vaping in 2018 over the past year, accompanied by widespread minimizing of its potential harm, dominated the findings of a closely watched annual survey of American teenagers.

The vaping increase was so precipitous, researchers said, that it was the largest annual jump in the use of any substance, including marijuana, they had seen in the project’s 44-year history.

In all, the researchers found, the rise amounted to 1.3 million more high school vapers in 2018 than in 2017.

“Vaping is reversing hard-fought declines in the number of adolescents who use nicotine,” Richard Miech, the study’s lead author and a sociologist at the University of Michigan, said in a statement. “These results suggest that vaping is leading youth into nicotine use and nicotine addiction, not away from it.”

The study, called Monitoring the Future, sponsored by the National Institute on Drug Abuse and administered by University of Michigan researchers, asks nearly 45,000 students in eighth, 10th and 12th grade about their behavior and attitudes around alcohol and a variety of drugs.

More than 1 in 10 eighth-graders said they vaped nicotine in the past year, while 37 percent of 12th-graders said they had done so, up from 27.8 percent in 2017.

The percentage of seniors who said they had vaped within the past 30 days — an indication of more frequent use — just about doubled, rising to 21 percent in 2018 from 11 percent in 2017.

Aside from vaping, the study had encouraging news about teenage use of most other drugs.

Tobacco cigarettes continued to remain at historic lows, with only 3.6 percent of high school seniors reporting that they smoke daily, compared with 22 percent two decades ago.

Marijuana levels remained stable, with 5.8 percent of seniors reporting daily use, a level that has stayed pretty much the same over the past 20 years.

Teenagers were beginning to move away from opioids and alcohol.

This latest survey aligns with findings released last month by the Centers for Disease Control and Prevention, which said that 3.6 million middle and high school students vaped in 2018.

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