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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 Marijuana/ Hashish for 8th Graders, 10th Graders, and 12th Graders; 2018 (in percent)*
Drug Time Period 8th Graders 10th Graders 12th Graders
Marijuana/ Hashish Lifetime 13.90 [32.60] [43.60]
Past Year 10.50 [27.50] [35.90]
Past Month 5.60 16.70 22.20
Daily 0.70 3.40 5.80

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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; 2017 (in percent)*
Drug Time Period Ages 12 or Older Ages 12 to 17 Ages 18 to 25 Ages 26 or Older
Marijuana/ Hashish Lifetime 45.20 15.30 52.70 47.50
Past Year 15.00 12.40 34.90 12.20
Past Month 9.60 6.50 22.10 7.90

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Clinical Trials

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NIDA. (). Marijuana. Retrieved from http://www.henanqingdian.com/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