| http://www.w3.org/ns/prov#value | - An alternative explanation is that substance use problems cause a mental illness, such as the case put forward for alcohol causing secondary depression (Fergusson et al., 2009), or cannabis triggering psychosis in vulnerable individuals (Degenhardt et al., 2003b, Muller-Vahl & Emrich, 2008, McGrath et al., 2010).
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