there is casual evidence that alcohol and caffeine increase hospitalisations for schizos. With marihuana its a harder riddle, what is a cause of another, I guess you can ask the same about other substances and origin
Anecdotal evidence, but I didnt seek marihuana, I actively avoided it, but had a crazy addict cousin who tried to force it on me for weird reasons. One time I was pretty drunked and tried it, got psychosis the next day finally ended in a psych ward. I am on meds till today
Smoking your first cannabis while drunk was indeed a bad idea! Hopefully the experience made you think about the abuse of alcohol and its consequences.