Disappointed in the comments here. There are NO studies involving psychosis and schizophrenia that factor in weed actually helping (hint: it contains an antipsychotic). Schizophrenia involves a defect in the gene responsible for producing the protein FABP5[1] which delivers our bodies naturally produced cannabinoids (eg, Anandamide and 2AG) to where they're needed[2]. Therefore it is not surprising there is a 'link' between those using cannabis and mental illness: flooding the bloodstream with cannabinoids somewhat makes up for the deficit in endocannabinoid delivery.
1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4240203
2. https://www.wnypapers.com/news/article/current/2018/03/15/13...