Cannabis Use and Earlier Onset of Psychosis ("the age at onset of psychosis for cannabis users was 2.70 years younger - than for nonusers. Alcohol use was not associated with a significantly earlier age at onset of psychosis.") Archives of General Psychiatry. Feb 2011. Viitattu 8.2.2011. (englanniksi)
BBC: Cannabis 'raises psychosis risk'news.bbc.co.uk. 27.7.2007. Viitattu 12.8.2007. (englanniksi) ”However, they said they could not rule out the possibility that people at a higher risk of mental illness were more likely to use the drug. Study author, Professor Glyn Lewis, professor of psychiatric epidemiology, said: "It is possible that the people who use cannabis might have other characteristics that themselves increase risk of psychotic illness. In an accompanying editorial, Danish researchers said the figures presented in the research translated to about 800 potentially avoidable cases of schizophrenia a year in the UK among 15- to 34-year-olds.”
