Long-term marijuana smokers may suffer a decrease in their verbal memory by the time they are middle-aged User 1260DividedByTree, in the /r/trees - home of the ents subreddit, 03 Feb 2016
Association Between Marijuana Use and Cognitive Function in Middle Age - Long-term marijuana use tied to decline in verbal memory in middle age, study finds User ANGRY_TWAT, in the Reddit Science subreddit, 02 Feb 2016
Association Between Lifetime Marijuana Use and Cognitive Function in Middle Age: The Coronary Artery Risk Development in Young Adults (CARDIA) Study (2016) User dustofoblivion123, in the DrugNerds subreddit, 01 Feb 2016