High-potency cannabis and the risk of psychosis
The British Journal of Psychiatry November 30, 2009 Marta Di Forti, Craig Morgan, Paola Dazzan et al. 577 citations
BACKGROUND: People who use cannabis have an increased risk of psychosis, an effect attributed to the active ingredient Delta 9-tetrahydrocannabinol (Delta 9-THC). There has recently been concern over an increase in the concentration of Delta 9-THC in the cannabis available in many countries. AIMS: To investigate whether people with a first episode of psychosis were particularly likely to use...