Tests of causal linkages between cannabis use and psychotic symptoms

Fergusson, Horwood & Ridder
Addiction Volume 100 Issue 3 Page 354
March 2005

The paper - Tests of causal linkages between cannabis use and psychotic symptoms

Followup article and critique - Psychosis, Hype And Baloney by Bruce Mirken and Mitch Earleywine (off-site link)

Letters to editor in response taken from Addiction. 2005 May;100(5):605-11:
"The Cannabis and Psychosis Connection Questioned" by Bruce Mirken and Mitch Earleywine and the original authors' response - "Mirken Refuted: Reasons for believing the association between cannabis use and risk of psychosis is probably causal" Here