More people in the United States are addicted to cannabis than to any other illicit drug, and prevalence of its use is rising, accompanied by a decline in its perceived harm among adolescents. Important maturational changes in prefrontal cortex during adolescence may make youth more vulnerable than adults to adverse effects from cannabis. Indeed, research shows impairments in memory performance and decision-making abilities of heavy cannabis users, most of whom initiate use during adolescence....
Source: https://osf.io/2htd5/