Self reported cannabis use as a risk factor for schizophrenia in Swedish conscripts of 1969: historical cohort study

By S. Zammit, P. Allebeck, S. Andréasson, I. Lundberg, G. Lewis. British medical journal, 2002

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Prevalence and correlates of self-reported psychotic symptoms in the British population (2004, background): “However, a number of cohort studies have shown that consumption of cannabis is a risk factor for later psychosis (e.g. Andreasson et al, 1987; van Os et al, 2002; Zammit et al, 2002).”
Cannabis and the brain. (2003, background): “More detailed follow-ups of some of the original Swedish cohort, however, claimed to have answered some of these criticisms (Andreasson et al., 1989; Zammit et al., 2002).”
The Psychotomimetic Effects of Intravenous Delta-9-Tetrahydrocannabinol in Healthy Individuals: Implications for Psychosis (2004, background): “…Leweke et al, 2000, 1999b; McGuire et al, 1995), epidemiological (Andreasson et al, 1987, 1988, 1989; Arseneault et al, 2002; McGuire et al, 1995; Zammit et al, 2002), genetic (Ujike et al, 2002), neurochemical (Leweke et al, 1999a), and postmortem (Dean et al, 2001) approaches, suggesting that…”