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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; 2012 (in percent)*
Drug Time Period Ages 12 or Older Ages 12 to 17 Ages 18 to 25 Ages 26 or Older
Marijuana/ Hashish Lifetime 42.80 17.00 52.20 44.40
Past Year [12.10] 13.50 31.50 [8.60]
Past Month 7.30 [7.20] 18.70 5.30

Latest Science

Featured Publications

Is Marijuana Medicine? (DrugFacts)

Revised March 2014.
Offers facts about marijuana's viability as a legal medical treatment. En Español

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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

High School and Youth Trends (DrugFacts)

Published December 2012. Revised January 2014.
Describes trends in high school and youth drug abuse and addiction, with an emphasis on marijuana, cigarettes, prescription drugs, alcohol and ecstasy. En Español

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

Principles of Adolescent Substance Use Disorder Treatment: A Research-Based Guide Cover

Principles of Adolescent Substance Use Disorder Treatment: A Research-Based Guide

Published January 2014. Revised January 2014.
Presents research-based principles of adolescent substance use disorder treatment; covers treatment for a variety of drugs including, illicit and prescription drugs, alcohol, and tobacco; presents settings and evidence-based approaches unique to treating adolescents.

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Past information on many drugs of abuse is available on our Archives site.

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This page was last updated March 2014

Research Report

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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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Featured Publication

Featured Publication

Drugs, Brains, and Behavior - The Science of Addiction

As a result of scientific research, we know that addiction is a disease that affects both brain and behavior.

Easy-to-read Drug Facts