A new study indicates that adolescent boys who use marijuana on a weekly basis may be at heightened risk for subclinical symptoms of psychosis. Alarmingly, these symptoms appear to persist, even after a year of abstinence from the drug.
“Our study provides definitive evidence that in heavy cannabis users, there is a detectable deficit of striatal dopamine release using an amphetamine challenge,” said Dr Weinstein. “Within the striatum, the subdivisions seem to have a different pattern, in contrast to reports of other substance abuse. And our exploratory analysis suggests that the deficits we are seeing in dopamine release in the striatum have a functional significance — that lower dopamine release is associated with lower working memory and learning performance.”
“If I were to design a substance that is bad for college students, it would be marijuana.” Dr. Hans Breiter, Professor in Psychiatry and Behavioral Sciences, Northwestern University.
The July 2014 edition of Science Magazine reports on a study by NIDA director Nora Volkow and colleagues about the impact of heavy marijuana use (about 5 joints a […]
NIDA Report on Marijuana Says that Potential for Addiction and Other Adverse Impacts Underestimated: Teens Especially at Risk
Science Daily reports that an article published on June 5 in the New England Journal of Medicine and authored by scientists from the National Institute on Drug Abuse (NIDA), “describes the science establishing that […]