FRIDAY, Sept. 6, 2019 (HealthDay News) — Marijuana use by U.S. college students in 2018 was the highest in 35 years, researchers report.

Their survey of about 1,400 respondents, ages 19 to 22 years, revealed that about 43 percent of full-time college students said they used some form of marijuana at least once in the past year, up from 38 percent in 2017, and previous month use rose to 25 percent from 21 percent, the Associated Press reported Thursday.

The 2018 rates are the highest found in the annual University of Michigan survey since 1983. About 6 percent of college students said they used marijuana 20 or more times in the past month compared with 11 percent of respondents the same age who were not in college, the AP reported.

“It’s the frequent use we’re most worried about” because it is associated with poor school performance and can harm mental health, researcher John Schulenberg said, the AP reported. In the United States, marijuana use is greater among college-age adults than any other age group.

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