Cannabis and psychosis. Is there epidemiological evidence for an association?
The British journal of psychiatry : the journal of mental science July 1, 1990 G Thornicroft
A review of the evidence finds no convincing support for a separate clinical diagnosis of 'cannabis psychosis'. Cannabis can produce brief acute organic reactions and, in moderate to heavy doses, psychotic episodes in clear consciousness. Ingestion in naive users or increasingly heavy use in habitual users can precipitate a schizophreniform episode. Heavy users may have an increased risk of developing schizophrenia in the subsequent 15 years. Well-controlled, longitudinal studies are needed to explore these associations further and their possible aetiological significance.