Harvard: Marijuana doesn’t cause schizophrenia

While cannabis may have an effect on the age of onset of schizophrenia it is unlikely to be the cause of illness
Psych Central (US)
Tuesday, December 10, 2013

New 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.