Skip to content
My WebMD Sign In, Sign Up

Substance Abuse and Addiction Health Center

Font Size

Pot Potency at Record High

Marijuana Potency Hit New Record in 2007; Experts Warn of Increased Risks
By
WebMD Health News
Reviewed by Louise Chang, MD

June 12, 2008 -- Marijuana potency reached a record high in 2007, making it more dangerous, government officials report.

University of Mississippi researchers tracked the potency of nearly 62,800 marijuana samples seized in the U.S. by government officials since 1975.

They found that in 2007, seized marijuana averaged 9.6% THC (marijuana's active ingredient) by dry weight. That's up from 8.75% in 2006 and from 0.88% in 1977.

"The increases in marijuana potency are of concern since they increase the likelihood of acute toxicity, including mental impairment," Nora Volkow, MD, director of the National Institute on Drug Abuse (NIDA), says in a news release.

"Particularly worrisome is the possibility that the more potent THC might be more effective at triggering the changes in the brain that can lead to addiction; however, more research is needed to establish this link between higher potency and higher addiction risk," Volkow says.

Today on WebMD

pills pouring from prescription bottle
Video
Hangover Myths Slideshow
Slideshow
 
Woman experiencing withdrawal symptoms
Article
prescription medication
Article
 
Hands reaching for medicine
Article
overturned shot glass
Article
 
assortment of medication
Article
How to Avoid Social Drinking
Article