High-potency cannabis, or frequent use, raises the risk of psychosis

ROYAL GORILLA, Girl Scout Cookies and Fat Banana are just a few of the improbably named strains of high-potency cannabis out there. In the former, levels of tetrahydrocannabinol (THC), the chemical behind the psychological effects of cannabis, are above 25%. Reviewers describe it as "overwhelming" for novices and a "beautiful euphoric couch-locking experience" for others. However enticing that may sound, regular use of cannabis with a potency greater than 10% increases the risk of developing psy...