A new study revealed this week shows that in spite of past claims, marijuana use does not affect IQ. The research, performed by the University College of London, was presented on Tuesday at the European Conference of Neuropsychopharmacology in Berlin.
The longitudinal study was performed on over 2,000 students. Researchers studied subjects–once at age 8 and again at age 15–born between 1991 and 1992. As the Washington Post reported, the study found
“’No relationship between cannabis use and lower IQ at age 15,’ when confounding factors – alcohol use, cigarette use, maternal education, and others – were taken into account. Even heavy marijuana use wasn’t associated with IQ.”
But there was a relationship between alcohol use and IQ…