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At one week the two groups differed significantly on only five PSE items: changed perception, thought insertion, non-verbal auditory hallucinations, delusions of control, and delusions of grandiose ability. One item (delayed sleep) differed at one month, and none at six months. The symptom cluster at one week is consistent with acute cannabis intoxication. Subjects and controls were mostly single, poorly educated, unemployed people with histories of psychotic disorders, and given major tranquillisers on admission. Compared with controls, subjects were younger, less likely to have psychiatric histories, more often male, Afro-Caribbeans with a history of convictions and compulsory admissions. The commonest diagnosis was schizophrenia. Use of the label \u2018cannabis-induced psychosis\u2019 may obscure a diagnosis of paranoid schizophrenia. A short-lived psychotic episode does occur in clear consciousness after cannabis intoxication, but chronic cannabis-induced psychosis was not found.<\/jats:p>","DOI":"10.1192\/bjp.161.5.648","type":"journal-article","created":{"date-parts":[[2008,10,15]],"date-time":"2008-10-15T00:56:07Z","timestamp":1224032167000},"page":"648-653","source":"Crossref","is-referenced-by-count":98,"title":["Cannabis and psychotic illness"],"prefix":"10.1192","volume":"161","author":[{"given":"D.C.","family":"Mathers","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.H.","family":"Ghodse","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"170","published-online":{"date-parts":[[2018,1,2]]},"reference":[{"key":"S0007125000130302_ref39","doi-asserted-by":"publisher","DOI":"10.1111\/j.1360-0443.1986.tb00348.x"},{"key":"S0007125000130302_ref10","first-page":"64","volume":"132","year":"1987","journal-title":"Canadian Journal of Psychiatry"},{"key":"S0007125000130302_ref9","doi-asserted-by":"publisher","DOI":"10.1001\/archpsyc.1974.01760070014002"},{"key":"S0007125000130302_ref37","doi-asserted-by":"publisher","DOI":"10.1111\/j.1360-0443.1989.tb00576.x"},{"key":"S0007125000130302_ref8","doi-asserted-by":"publisher","DOI":"10.3109\/10826086909062016"},{"key":"S0007125000130302_ref7","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.288.6423.1047"},{"key":"S0007125000130302_ref36","doi-asserted-by":"publisher","DOI":"10.1111\/j.1360-0443.1988.tb00482.x"},{"key":"S0007125000130302_ref6","doi-asserted-by":"publisher","DOI":"10.1001\/jama.1939.02800260006002"},{"key":"S0007125000130302_ref35","first-page":"195","volume":"108","year":"1973","journal-title":"Canadian Medical Association Journal"},{"key":"S0007125000130302_ref5","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291700042938"},{"key":"S0007125000130302_ref34","doi-asserted-by":"publisher","DOI":"10.3109\/10826088609027384"},{"key":"S0007125000130302_ref4","first-page":"119","volume":"126","year":"1970","journal-title":"American Journal of Psychiatry"},{"key":"S0007125000130302_ref33","volume-title":"Du Hashish et de l'alienation mentale.","year":"1845"},{"key":"S0007125000130302_ref3","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0447.1989.tb10296.x"},{"key":"S0007125000130302_ref32","doi-asserted-by":"publisher","DOI":"10.1111\/j.1360-0443.1985.tb05287.x"},{"key":"S0007125000130302_ref2","first-page":"1483","volume":"2","year":"1987","journal-title":"Lancet"},{"key":"S0007125000130302_ref31","first-page":"187","volume":"86","year":"1959","journal-title":"British Journal of Medical Psychology"},{"key":"S0007125000130302_ref1","doi-asserted-by":"crossref","first-page":"972","DOI":"10.1192\/bjp.104.437.972","volume":"104","year":"1958","journal-title":"Journal of Mental Science"},{"key":"S0007125000130302_ref30","doi-asserted-by":"crossref","first-page":"533","DOI":"10.1016\/S0193-953X(18)30611-7","volume":"9","year":"1986","journal-title":"Psychiatric Clinics of North America"},{"key":"S0007125000130302_ref29","volume-title":"Clinical Psychiatry.","year":"1960"},{"key":"S0007125000130302_ref28","volume-title":"The Marijuana Problem in the City of New York.","year":"1944"},{"key":"S0007125000130302_ref27","doi-asserted-by":"publisher","DOI":"10.1111\/j.1360-0443.1991.tb03104.x"},{"key":"S0007125000130302_ref25","first-page":"129","volume":"11","year":"1988","journal-title":"Social Science and Medicine"},{"key":"S0007125000130302_ref24","volume-title":"The Proceedings of the Oxford Symposium on Cannabis. \u201cMarijuana 1984\u201d. 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