There’s a cannabis psychosis and yes it’s real and is scary. And yes it will make matters worse. There’s also addiction to cannabis, which is real even though many argue you can’t get addicted to that, yep you can. And yes it will make matter worse. It’s also common for mentally ill stop taking meds because pot makes them feel good so they think they are cured, two weeks later they are back to psych hospital sicker than ever.

Marijuana isn’t a medication. I doubt psychiatrists will be widely prescribing it for mental illness. It might be ok as supplemental thing but then again it mellows out some people but it has completely opposite effect on others.

But other than that if someone wants to partake and they aren’t harming anyone like driving high or in charge of infants, by no means who’s to say they can’t do it to help with mental health issue. Alcohol is a drug but ton of people drink and say it makes them feel better. I doubt they’ll prescribe that to anyone though