Within the contradictions of the use of Marijuana and secondary effects we read that Marijuana induces psychopsis.
Also the pages that recommend its use but minimize its negative effects by mentioning that it induces psychosis seek to exempt their responsibility when they write: "As a result, patients with a (family) history of psychotic disorders, in particular, schizophrenia and bipolar disorder, should undergo careful psychiatric monitoring when using cannabis."

"So if you've experienced psychotic symptoms in the past, it's absolutely necessary to talk to a doctor experienced in recommending cannabis before even trying it."