Several studies have established a link between cannabis and psychosis. However the causal role of cannabis in schizophrenia is still not clear. The aim of this paper is to summarise the literature pertaining to whether cannabis causes psychosis, whether the continued use of cannabis by patients with schizophrenia affects the course of the disease and its treatment, and whether it is possible to reduce cannabis use in patients who have a psychotic disorder.
Keywords: cannabis, psychosis, psychotic illness, schizophrenia