Background: Assessing marijuana's impact on intelligence quotient (IQ) has been hampered
by a lack of evaluation of subjects before they begin to use this substance. Using data from a …

Marijuana is one of the most commonly used drugs in the United States, and use during
adolescence—when the brain is still developing—has been proposed as a cause of poorer …

Marijuana use is common in adolescence, yet neural consequences have not been well
delineated. This review seeks to ascertain whether heavy marijuana use in adolescence is …

To the Editor: Dr Solowij and colleagues1 concluded that their findings “confirm that long-
term heavy cannabis users show impairments in memory and attention that endure beyond …

Background. Results of previous research examining long-term residual effects of marijuana
use on cognition are conflicting. A major methodological limitation of prior studies is the …

Background: Marijuana is the most commonly used illicit substance in the United States.
Use, particularly when it occurs early, has been associated with cognitive impairments in …

There is much debate about the impact of adolescent cannabis use on intellectual and
educational outcomes. We investigated associations between adolescent cannabis use and …

Objective: The effect of adolescent marijuana use on brain development remains unclear
despite relaxing legal restrictions, decreased perceived harm, and increasing use rates …

Background: Although about 7 million people in the US population use marijuana at least
weekly, there is a paucity of scientific data on persistent neurocognitive effects of marijuana …

Objective: Despite growing evidence that chronic marijuana use is associated with cognitive
impairment, particularly when use is initiated at an early age, national trends demonstrate …