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Marijuana

Brief Description

Marijuana is a dry, shredded green and brown mix of leaves, flowers, stems, and seeds from the hemp plant Cannabis sativa. In a more concentrated, resinous form, it is called hashish, and as a sticky black liquid, hash oil. The main psychoactive (mind-altering) chemical in marijuana is delta-9-tetrahydrocannabinol, or THC. Learn more about marijuana

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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; 2013 (in percent)*
Drug Time Period 8th Graders 10th Graders 12th Graders
Marijuana/ Hashish Lifetime 16.50 35.80 45.50
Past Year 12.70 29.80 36.40
Past Month 7.00 18.00 22.70
Daily 1.10 4.00 6.50

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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; 2013 (in percent)*
Drug Time Period Ages 12 or Older Ages 12 to 17 Ages 18 to 25 Ages 26 or Older
Marijuana/ Hashish Lifetime 43.7 16.4 51.9 45.7
Past Year 12.6 13.4 31.6 9.2
Past Month 7.5 7.1 19.1 5.6

Latest Science

Related Publications

Marijuana (DrugFacts)

Published December 2012. Revised January 2014. Offers facts about marijuana, including how it is used, its effects on the brain and overall health, treatment options, and the potential of marijuana as a therapy for various health problems. En Español

Publication: Research Report Series - Marijuana

Marijuana (Research Reports)

Published October 2002. Revised July 2012. 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. En Español

Is Marijuana Medicine? (DrugFacts)

Revised April 2014. Offers facts about marijuana's viability as a legal medical treatment and about potential and approved treatments using chemicals derived from marijuana (cannabinoids). En Español

Publication Cover

Marijuana: Facts Parents Need to Know

Published April 2001. Revised March 2014. Brochure, in question-and-answer format, that provides facts about marijuana for parents and offers tips for talking with their children about the drug and its potential harmful effects. En Español

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Marijuana: Facts for Teens

Published April 2001. Revised July 2013. Presented in question-and-answer format and targeted to teens, provides facts about marijuana and its potential harmful effects. En Español

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This page was last updated March 2014

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National Institute of Drug Abuse. Marijuana Retrieved from http://www.drugabuse.gov/drugs-abuse/marijuana

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Research Report

Research Report Cover

Marijuana

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.

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Marijuana facts for parents and teens