Past-year use of marijuana and hallucinogens by adults 35 to 50 years old continued a long-term upward trajectory to reach all-time highs in 2022, according to the Monitoring the Future (MTF) panel study, an annual survey of substance use behaviors and attitudes of adults 19 to 60 years old. Among younger adults aged 19 to 30, reports of past-year marijuana and hallucinogen use as well as marijuana and nicotine vaping significantly increased in the past five years, with marijuana use and vaping at their highest historic levels for this age group in 2022.