Schizophrenia linked to marijuana use disorder is on the rise, study finds
I can only speak from personal experience, which is of course limited.  I smoked occasionally in my 20s, but not since (I'm middle-aged now).  I've been friends and acquaintances with many people that smoke a lot.  I see a trend among these people - not necessarily schizophrenia (I'm not a psychologist and probably wouldn't even notice a mild case) - but instead a consistent arrogance and self-importance.  It's peculiar - they may be contributing very little to society (or maybe a lot), but regardless there's a sense of superiority that seems to crop up among them all.  Maybe even narcissism?I could be completely wrong.  I don't express this to assert it, but rather to ask if anyone else has noticed anything similar.