My son became psychotic after going to college in Colorado and using cannabis.
Google: ‘psychosis’ and ‘cannabis’, and you will find many studies proving a connection.
“They found that those who used cannabis by the age of 15 were more than three times (i.e. 300% higher) as likely to develop illnesses such as schizophrenia.”
“...it was a frightening repeat of an episode a few days earlier when, with no papers to roll a joint, he ate a chunk of cannabis resin and collapsed in a nightclub toilet. ‘When I woke up I heard someone saying: “It’s OK Steve, you can get up now, you’re all right”,’ he recalls. ‘When I looked around, there was no one there...That’s when my voices started and I’ve had them ever since.”