That does not include the number of incarcerated individuals or those in mental institutions.
Harvard: Marijuana Doesn’t Cause Schizophrenia Last updated: 8 Aug 2018New research from Harvard Medical School, in a comparison between families with a history of schizophrenia and those without, finds little support for marijuana use as a cause of schizophrenia.
“The results of the current study suggest that having an increased familial morbid risk for schizophrenia may be the underlying basis for schizophrenia in cannabis users and not cannabis use by itself,” note the researchers.