Long term marijuana use is linked to impaired verbal memory

Long term marijuana use is associated with impaired verbal memory in middle age but does not affect other aspects of cognitive function, a 25 year follow-up study has shown.1

The Coronary Artery Risk Development in Young Adults (CARDIA) study included 3885 black and white participants aged 18-30 at the start of the study, who were asked periodically about their marijuana use over the next 25 years.

After 25 years some …