I linked below a systematic review where many of the studies do find this to be the case.

I’m glad Germany hit back by rebuking Rubio’s slam

This systematic review lists 12 studies that almost all concluded THC has a causative relationship with schizophrenia.

Alcohol can make you feel like shit and can do great damage if used too often, but meth and K2 can fuck someone’s brain up after even one use due to lack of quality control

They cite one such study right there in the article, and there are others: https://pubmed.ncbi.nlm.nih.gov/38775165/

This isn’t new information either, the experience I related above was a decade ago, and the impact of weed on people prone to psychotic disorders was already well known to the medical community at that time.

Substance-insuced psychosis (psychotic symptoms while you’re intoxicated) is a different diagnosis than a psychotic episode. That psychotic symptoms are not due to substance intoxication is actually one of the criteria of a psychotic episode. What I’m talking about are people for whom weed can trigger a psychotic episode that doesn’t go away after the high wears off.

I worked inpatient psych for a long time, and can tell you first-hand the link between psychosis and cannabis is real. No, this does not mean “if you smoke weed you’re going to get psychotic!” What it does mean is that if you’re someone with a genetic predisposition for schizophrenia (e.g. you have a known family history) weed is a potential trigger for a psychotic episode. If someone has already developed schizophrenia, smoking weed can make their symptoms worse and more difficult to manage with medications.

80% of people coming through the psych hospital, whatever, I don’t care if you smoke weed. Honestly, I wish people would smoke weed rather than use meth, K2, or a bunch of other drugs that fuck people up. But for that subset of people prone to psychotic episodes, the conversation centers around “some people can smoke weed and be fine, and you are not one of those people.”

The most common ages for men to develop first episode psychosis are 18-25, and while it’s dumb that this article focuses on teenagers, the risk in that age group is genuinely higher. This article really is dumb overall and does not explain any of this well