Cannabis use and psychosis: a longitudinal population-based study.

By J. Os, M. Bak, M. Hanssen, R. Bijl, R. Graaf, H. Verdoux. American Journal of Epidemiology, 2002

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Probability and predictors of transition from first use to dependence on nicotine, alcohol, cannabis, and cocaine: Results of the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) (2010, background): “The co-occurrence of mental and SUD may be due to self-medication practices or the existence of common liability factors (Leonard et al., 2007; Neale and Kendler, 1995; van Os et al., 2002).”
The Psychotomimetic Effects of Intravenous Delta-9-Tetrahydrocannabinol in Healthy Individuals: Implications for Psychosis (2004, background): “Several large sample studies (n¼ 7000–50 0000) suggest that moderate (more than 20 times) lifetime exposure to cannabis is associated with a higher risk to develop schizophrenia later on (Andreasson et al, 1988; van Os et al, 2002; Zammit et al, 2002).”