Is cannabis legal where you live? Criminality causes stress and paranoia.

Are you living in a heavily Christian environment? Asking because in heavily religious environments, schizophrenia with religious illusions often occurs as a result of internal conflict between sin-programming and self-perception.

Is cannabis socially accepted or are people forced to choose between cannabis and other people? Social exclusion has in some studies been ranked more stressful than getting raped, so some sort of social PTSD can be expected to develop in these kind of environments to those who get excluded.

On the other hand, my experience is that many people with bipolar find it improves their mood.

If you have psychiatric difficulties, then it's not a good idea to mess with drugs that are in any way psychedelic. If you have problems with hypertension, it's not a good idea to mess with caffeine or cocaine.