Don't Blame Pot for Teens' IQ Drop, Study Says

Instead, the results suggest that if teens experience a cognitive decline, other factors, such as genetics or that young person's family environment, are more likely to be responsible for the drop, the researchers said. The implications of the new findings are that "it is unlikely that the exposure to marijuana itself is causing children to show intellectual change," Isen told Live Science. Previous research on marijuana use during adolescence has yielded mixed results.