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 with high amounts of THC can also be made from the cannabis plant. Learn more about marijuana
Also more about:
- Marijuana and Cannabinoid Research at NIDA
- NIDA's Role in Providing Marijuana for Research
- NIH Research on Marijuana and Cannabinoids
- DrugFacts: Is Marijuana Medicine?
- Health Effects
Statistics and Trends
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Drug | Time Period | 8th Graders | 10th Graders | 12th Graders |
---|---|---|---|---|
Marijuana/ Hashish | Lifetime | [12.80] | 29.70 | 44.50 |
Past Year | [9.40] | 23.90 | 35.60 | |
Past Month | [5.40] | 14.00 | 22.50 | |
Daily | [0.70] | 2.50 | 6.00 |
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Drug | Time Period | Ages 12 or Older | Ages 12 to 17 | Ages 18 to 25 | Ages 26 or Older |
---|---|---|---|---|---|
Marijuana/ Hashish | Lifetime | 44.00 | 15.70 | 52.70 | 46.00 |
Past Year | 13.50 | 12.60 | 32.20 | 10.40 | |
Past Month | 8.30 | 7.00 | 19.80 | 6.50 |
Latest Science
- Women less sensitive than men to analgesic, but not rewarding effects of cannabis (September 2016)
- Marijuana Use Raises SUD Risk (February 2016)
- Effects of Cannabis Use on Human Behavior, Including Cognition, Motivation, and Psychosis: A Review (JAMA Psychiatry, February 2016)
- Brain structure and predisposition for cannabis use (September, 2015)
- Importance of controlling for alcohol use when exploring marijuana’s impact on brain structure (May, 2015)
- Cannabinoid Receptor 2: Pain Treatment Without Tolerance or Withdrawal (April, 2015)
- Recreational marijuana use associated with increased impulsivity and hostility in daily life (February 17, 2015)
- Cannabinoid CB2 Receptors in Brain Reward Systems (January 13, 2015)
Related Videos
- I-Science: #CPDD What's Hot - Mothers and Marijuana Use (October 2015)
- I-Science: #CPDD What's Hot - Breastfeeding and Marijuana Use (August 2015)
- NIDA Encourages Community Based Marijuana Research (November 2014)
Related Resources
- Mixed Signals: The Administration’s Policy on Marijuana, Part Four -- Scientific Focus on the Adverse Health Effects of Marijuana Use (Testimony to Congress, June 2014)
- Marijuana: Facts for Teens
- Marijuana: Download the Facts Poster (Teaching Guide)
- Heads Up: Real News About Drugs and Your Body- Year 11-12 Compilation for Students
- Heads Up: Real News About Drugs and Your Body- Year 11-12 Compilation for Teachers
- Marijuana’s Lasting Effects on the Brain, (Message from the NIDA Director, September 2012)
- NIDA for Teens: Marijuana
Emerging Trends & Alerts
Get more information on Emerging Trends and Alerts, we will update this page with the latest research findings as they develop.