The authors of this study investigated the association between the degree of cannabis consumption and psychosis. Higher levels of cannabis use were associated with increased risk for psychosis in all included studies. The authors concluded that “high levels of cannabis use increase the risk of psychotic outcomes and confirms a dose-response relationship between the level of use and the risk for psychosis … although a causal link cannot be unequivocally established.”
by Arianna Marconi, Marta Di Forti, Cathryn M Lewis, Robin M Murray, Evangelos Vassos.
Read the full study at National Library of Medicine.