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Brief Description

Marijuana refers to the dried leaves, flowers, stems, and seeds from the hemp plant, Cannabis sativa. The plant contains the mind-altering chemical delta-9-tetrahydrocannabinol (THC) and other related compounds. Extracts can also be made from the cannabis plant. Read the DrugFacts

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Statistics and Trends

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Monitoring the Future Study: Trends in Prevalence of Various Drugs for 8th Graders, 10th Graders, and 12th Graders; 2019 (in percent)*
Drug Time Period 8th Graders 10th Graders 12th Graders
Any Vaping Lifetime 24.30 [41.00] 45.60
Past Year 20.10 35.70 40.60
Past Month 12.20 [25.00] [30.90]
Marijuana/ Hashish Lifetime 15.20 34.00 43.70
Past Year 11.80 28.80 35.70
Past Month 6.60 18.40 22.30
Daily [1.30] [4.80] 6.40

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National Survey on Drug Use and Health: Trends in Prevalence of Marijuana/ Hashish for Ages 12 or Older, Ages 12 to 17, Ages 18 to 25, and Ages 26 or Older; 2018 (in percent)*
Drug Time Period Ages 12 or Older Ages 12 to 17 Ages 18 to 25 Ages 26 or Older
Marijuana/ Hashish Lifetime 45.30 15.40 51.50 47.80
Past Year 15.90 12.50 34.80 13.30
Past Month 10.10 6.70 22.10 8.60

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Clinical Trials

Clinical trials are research studies in human volunteers conducted to answer specific health questions. Learn about the NIH-sponsored clinical trials available to you.

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NIDA. (). Marijuana. Retrieved from https://www.drugabuse.gov/drugs-abuse/marijuana

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Marijuana and Cannabinoids: A Neuroscience Research Summit

Brain March 22-23, 2016

Research Report

Marijuana Research Report Cover


Explores the latest research on marijuana, including the scope of marijuana use in the U.S., health consequences, its effects on every-day activities, available treatments.

Easy-to-read Drug Facts