Daily cannabis use linked to increased risk of developing psychotic disorder

Researchers based at King’s College London (UK) have performed a Europe-wide study to analyze the effect of daily cannabis use on population rates of psychotic disorder. The study, which has been published in The Lancet Psychiatry, raises concerns over the legalization of cannabis. Previous studies have determined that there is an association between cannabis use and psychosis. However, until now there have been no reports on whether cannabis use affects rates of psychosis at a populational level. In order to estimate the incidence rate of psychosis, individuals with first episode psychosis were identified according to the records of mental health...