Continuous Marijuana Use May Harm Verbal Memory, Study Shows

Long-term marijuana smokers may suffer a decrease in their verbal memory by the time they are middle-aged, according to a new study. Appearing in JAMA Internal Medicine, the paper reveals how other elements of cognition, such as processing speed and executive function, do not appear to be affected by cannabis use.

The research was conducted by surveying participants of the Coronary Artery Risk Development in Young Adults (CARDIA) study, all of whom were aged 18 to 30 during the period between March 1985 and June 1986. Subjects were then interviewed about their marijuana use after 2, 5, 7, 10, 15, 20 and 25 years, before being asked to undertake a series of cognitive tests in August 2011.

I smoked a pretty fair amount of marijuana in high school, and it did seem to lessen my cognitive powers in a number of ways. It also made me think things I didn’t want to think. I don’t like that drug. The only reason I smoked as much of it as I did was because people were always trying to get me high. I rarely bought it myself. Some guys love marijuana, though.