This must mean psychosis correlated with cannabis use in a controversial way, complicated by matters of genetics, environment, the use of other drugs, and pre-e

This must mean psychosis correlated with cannabis use in a controversial way, complicated by matters of genetics, environment, the use of other drugs, and pre-existing psychiatric conditions. It means schizophrenia, and possibly other forms of long-term psychosis but I'm not sure what those are. Delusions of persecution? But that isn't very different.