Lifetime cannabis use does not appear to negatively impact cognitive decline, and may actually protect against it, according to a longitudinal study published in Brain and Behavior.
The research assessed the relationship between marijuana use and age-related cognitive changes in a cohort of 5,162 Danish men over a span of 44 years.
Participants’ IQs were evaluated in early adulthood, with a mean age of 22, and again in late midlife, at an average age of 62. The study found that men with a history of cannabis use experienced “significantly less cognitive decline” over their lifetimes compared to non-users.
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