"An Australian study found that prolonged use of cannabis or marijuana by young adults was linked to a higher risk of developing psychosis, with the highest risk affecting those who started using the substance in their teens, and continued using it for 6 years or more into adulthood: the risk of developing psychosis among these users was more than double that of never users."
When I worked as a psychiatrist I saw young men who were living with psychosis precipitated by cannabis use. It was heartbreaking.
