This will be unpopular but I have found Marijuana users to be extremely biased against any negatives raised about the drug and conversely very biased towards accepting anything positive. Because of this and the fact that psychosis is rare, i.e. not the typical experience, the answer you are mostly likely to get here is that Marijuana doesn’t cause it. You can only trust their personal “had it or didn’t have it” but not what they say about never seeing it in others.

Imagine that it causes psychosis in 1 in 1000 users (I don’t know the real ratio this is just for example). That would mean, based on personal experience alone, you would get 999 answers saying it’s totally fine, and 1 saying it causes psychosis. You walk away thinking it’s safe when maybe for you, it’s not. Even if it was 1 in 10 you’d probably still think the consensus is that it’s safe the 1 saying its not is going against the consensus so must have an agenda. Not what if the rate in the general population is 1 in 1,000,000 but the rate for people with a family history of mental illness is 1 in 3? Both can be true but which is the one that matters to you? Here you’d only be finding the 1 in a million number when you really want to know the one in 3 number.

Things like this are not about opinions they are about statistics. As someone else said, don’t ask social media for medical matters, science is not about consensus it’s about evidence. The laws of physics don’t change based on how many people believe something.

Many comments here are the equivalent of saying “I’ve never seen a car crash so they must be made up, it’s just fear mongering by the auto industry to put useless air bags and seat belts in the car to charge you more”.