Scientists followed marijuana and alcohol use among 6500 teenage students in the USA over a seven year longitudinal study for the RAND Corporation.
Youths aged 11 to 17 were required to complete surveys between middle and high school. Researchers found these learners had worse grades and delinquent aggressive behavior.
Lead author of the study and behavioral scientist Dr Elizabeth D’Amico said that the study showed alcohol and marijuana use were issues that needed to be tackled early on in life, especially in Asian, black and Hispanic students.
To highlight the dangers of cannabis and alcohol use in young adults; users ended up in lower social classes, worked in less skilled jobs and were more aggressive.
