India, Aug. 20 -- A meta-analysis of 149 studies involving more than 71,000 people found that cannabis use is associated with an earlier onset of psychosis, according to research published in Biological Psychiatry. The analysis examined data from 18,272 cannabis users and 52,801 non-users.
Cannabis users developed psychosis an average of 2.50 years earlier than non-users overall. The timing gap widened among individuals whose symptoms emerged later in life.
In studies where psychosis onset occurred between ages 20 and 25, cannabis users developed symptoms approximately 1.60 years earlier than non-users. The difference increased to 4.43 years for onset between ages 25 and 30, and reached 6.30 years in studies where onset occurred at age 30...