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Long term marijuana use is linked to impaired verbal memory

BMJ 2016; 352 doi: (Published 02 February 2016) Cite this as: BMJ 2016;352:i619
  1. Jacqui Wise
  1. 1London

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 …

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