This document discusses cannabis (marijuana) and its effects. It notes that cannabis is a tropical plant containing psychoactive chemicals like THC. Short term effects of cannabis use include euphoria, anxiety, hunger and paranoia. Long term, cannabis can lead to cannabis use disorders like dependence and abuse, as well as cannabis intoxication and induced disorders like cannabis induced psychotic disorder and anxiety disorder. The document provides statistics on cannabis use and outlines various treatment options for cannabis use disorders, including individual and group therapy, inpatient/outpatient treatment, and halfway houses/therapeutic communities. It concludes with a case study of a 15-year-old girl who developed psychological problems and delusions from regular weekend marijuana use