As someone who was diagnosed with Schizophrenia, had several bouts of psychosis, and settled into BiPolar disorder without the psychosis, I can speak on this subject a bit. As a kid I exhibited the typical, thinking fast and trying to talk just as fast. My first major manic episode I recall was while studying for a midterm, where instead I had inspiration and handwrote a 8 page business plan. After my my first psychotic break, a year later I spent all night down the rabbit hole of importing raincoats from China. I showed no Schizophrenic symptoms until a major psychotic break that triggered my underlying proclivity towards Schizophrenia, partially by roadtripping to a new place and excessively smoking marijuana. I ended up in an out-of-state hospital for several days before transferring to a local one. My family thankfully had insurance, but the profit-driven company battled with us to deny paying for that expensive out-of-state care and treatment, thankfully they paid. I couldn't get non-group insurance until insurance companies could not as easily deny you coverage for pre-existing conditions.
Before that event I had genuinely enjoying smoking for nearly 2 years in college with no paranoia. Uncharacteristically, I got into minor legal trouble thanks to a dumb, drunken night. The day my probation ended I lit it up again, leading to a mild psychotic episode with friends who were freaked out. That was the end of marijuana for me. Never tempted to touch it again as I know that is seriously playing with fire given my tendencies. I've had one other paranoia-fueled episode where I went off my medications because I didn't like the side effects. I somehow got tangled with a local urban gang, after they broke into my house and stole my roommate's golf clubs and spotted my expensive studio equipment only to stake the place out for another burglary. I avoided hospitalization with the help of close family this time.
The biggest thing for people with BiPolar or Schizophrenics is to stay on their medication. It's a very tragic feedback loop, you feel good or normal so you go off your meds. Then you are OK for a while, then you are nearing a nervous breakdown, manic episodes (which are really fun for most people), paranoia, or deep depressive episode (which is why so very many BiPolar people commit suicide). Every time I went off my medication, a break down was near, and you had to basically hit the "reset button" on your life again. Start a new job, new location, try again. This time, you pledge to stay on your medication, your family reminds you as well. Things can stabilize when you get on the right medication with the lowest effective dosage, get regular sleep and exercise. I am stable now, with the help of family, friends, low dosage medication, and exercise. (In that order)