Cannabis critics and cannabis activists are constantly at odds over whether or not marijuana use can lead to cognitive declines in attention, memory, and learning. A recent study presented at the annual congress of the European College of Neuropsychopharmacology (ECNP) in Berlin has revealed that “casual” marijuana use does not lead to lower IQ scores. However, “heavy” marijuana use did lead to poorer in-school examination scores.

“Our findings suggest cannabis may not have a detrimental effect on cognition, once we account for other related factors, particularly cigarette and alcohol use,” Claire Mokrysz, lead researcher from University College London, said in a statement. “This may suggest that previous research findings showing poorer cognitive performance in cannabis users may have resulted from the lifestyle, behavior, and personal history typically associated with cannabis use, rather than cannabis use itself.”

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