A group of researchers at University of Pennsylvania’s Perelman School of Medicine conducted a review of 69 studies on cannabis-use and cognitive functioning in adolescent and young adults, performed between 1973 and 2017. What they found was that the impact cannabis has on cognitive function is much smaller than previously asserted.
"Results indicate that previous studies of cannabis in youth may have overstated the magnitude and persistence of cognitive deficits associated with use."
While smoking marijuana may have a small effect on cognitive functioning within 72 hours of use, the effect becomes insignificant over time.
"Although continued cannabis use may be associated with small reductions in cognitive functioning, results suggest that cognitive deficits are substantially diminished with abstinence."
These findings serve to debunk the widespread stereotype that cannabis use makes you stupid and hopefully will help reduce the stigma that many cannabis-users face.
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