June 21, 2021 – During the follow-up, participants were given standard cognitive tests that measured three things: processing speed (for example, solving simple math problems), verbal memory (word recall), and higher-level skills that show how well different parts of the brain are working together.
The longer people used marijuana, the worse they did on all three fronts. However, after accounting for other factors that could affect brain performance, such as education level, only the association between long-term marijuana use and verbal memory persisted. Specifically, for every five years that someone uses marijuana, they recall one less word from a list of 15.
The study authors admit they were a bit surprised to find such a consistent association, and say they plan to invite participants back for a 30-year visit, at which time they’ll undergo cognitive testing.
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