According to an article posted by SAM - Smart Approaches to Marijuana on March 19, 2019, a landmark study published in the prestigious Lancet Psychiatry Journal finds that daily use of high potency marijuana is linked to greater rates of psychosis in Europe. According to the study, an estimated five in ten new cases of psychosis in Amsterdam and three in ten new cases in London are linked with high potency marijuana use. https://learnaboutsam.org/groundbreaking-new-uk-study-confirms-link-between-daily-high-potency-marijuana-use-and-psychosis/