{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T12:23:22Z","timestamp":1788783802260,"version":"build-2803163510"},"reference-count":18,"publisher":"SAGE Publications","issue":"12","license":[{"start":{"date-parts":[[2021,2,11]],"date-time":"2021-02-11T00:00:00Z","timestamp":1613001600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"D\u00e9partement de psychiatrie du CIUSSS de l'Estrie-CHUS"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Can J Psychiatry"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:sec>\n                    <jats:title>Objectives:<\/jats:title>\n                    <jats:p>The principal objective of our study was to document the short-term impact of the legalization of recreational cannabis on active cannabis use, cannabis use disorder, and various psychotic disorders.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>We carried out a retrospective observational study of patients who were at least 12 years old and who had visited a psychiatrist in the emergency unit of the Centre hospitalier universitaire de Sherbrooke (CHUS). We included all the consultations of this type over a 5-month period, immediately following the legalization of recreational cannabis in Canada. We then divided our population into an adult (over 18) and teenager group (12 to 17) compared the data to the data from consultations made 2 years earlier, using a generalized linear mixed model.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>We examined consultations in patients over 18 years old in prelegalization ( n = 1,247) and postlegalization ( n = 1,368) groups. We observed a statistically significant increase in the use of cannabis (28.0% to 37.1%; odds ratio [ OR] = 1.81 [1.34 to 2.44], P = 0.00011) as well as an increase in diagnoses of active cannabis use disorder (17.7% to 24.3%; OR = 1.53 [1.13 to 2.08], P = 0.0064). The increase in cannabis use disorder was more prominent among patients between 18 and 24 years old (17.3% to 25.9%; OR = 2.27 [1.17 to 4.40], P = 0.015). We observed no statistically significant difference in terms of psychotic disorder diagnoses (27.4% to 29.2%; OR = 1.17 [0.84 to 1.63], P = 0.35)]. Conversely, we identified a greater proportion of patients who had a personality disorder diagnosis in the postlegalization period (39.6% to 44.9%; OR = 1.35 [1.02 to 1.80], P = 0.038). Examination of pediatric (under 18 years old) consultations revealed no statistically significant differences.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Although an affirmative conclusion is tentative, the current findings suggest a first link between the legalization of cannabis in Canada and increased diagnoses of cannabis use disorder, as well as cannabis use in general among patients in a university hospital psychiatric emergency department.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0706743720984684","type":"journal-article","created":{"date-parts":[[2021,2,13]],"date-time":"2021-02-13T06:48:46Z","timestamp":1613198926000},"page":"1069-1076","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":33,"title":["The Potential Impact of Recreational Cannabis Legalization on the Prevalence of Cannabis Use Disorder and Psychotic Disorders: A Retrospective Observational Study"],"prefix":"10.1177","volume":"66","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2968-818X","authenticated-orcid":false,"given":"Catherine","family":"Vignault","sequence":"first","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Am\u00e9lie","family":"Mass\u00e9","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Gouron","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacques","family":"Quintin","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Khashayar Djahanbakhsh","family":"Asli","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Semaan","sequence":"additional","affiliation":[{"name":"Faculty of Medicine and Health Sciences, Department of Psychiatry, Universit\u00e9 de Sherbrooke, Qu\u00e9bec, Canada, J1G 2E8"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2021,2,11]]},"reference":[{"key":"bibr1-0706743720984684","unstructured":"Government of Canada. Canadian tobacco alcohol and drugs (CTADS): 2015 summary. Published 2017 [updated 2017 March; accessed 2020 Apr 19]. https:\/\/www.canada.ca\/en\/health-canada\/services\/canadian-tobacco-alcohol-drugs-survey\/2015-summary.html"},{"issue":"4","key":"bibr2-0706743720984684","first-page":"8","volume":"26","author":"Rotermann M","year":"2015","journal-title":"Health Rep"},{"key":"bibr3-0706743720984684","unstructured":"Statistics Canada. Canadian Community Health Survey \u2013 Mental Health (CCHS) Ottawa, Statistics Canada; 2012 [updated 2013 Sep 18; accessed 2020 Oct 16]. Available from: https:\/\/www23.statcan.gc.ca\/imdb\/p2SV.pl?Function=getSurvey&SDDS=5015."},{"key":"bibr4-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugpo.2018.03.011"},{"key":"bibr5-0706743720984684","unstructured":"Minister of Justice. Cannabis act. Published 2019 [Accessed 2020 Apr 17]. https:\/\/laws-lois.justice.gc.ca\/eng\/acts\/c-24.5\/FullText.html"},{"key":"bibr6-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2015.3278"},{"key":"bibr7-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1016\/S2215-0366(14)00130-8"},{"key":"bibr8-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1016\/S2215-0366(19)30048-3"},{"key":"bibr9-0706743720984684","unstructured":"Association des m\u00e9decins psychiatres du Qu\u00e9bec, M\u00e9moire pr\u00e9sent\u00e9 \u00e0 la commission de la sant\u00e9 et des services sociaux, Published January 17th 2018. [Accessed 2020 dec 21]."},{"key":"bibr10-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1016\/S2215-0366(16)30208-5"},{"key":"bibr11-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1111\/add.14031"},{"issue":"2","key":"bibr12-0706743720984684","first-page":"201","volume":"44","author":"Gouron D","year":"2019","journal-title":"Sant\u00e9 Ment Au Qu\u00e9"},{"key":"bibr13-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1001\/jamapediatrics.2016.3624"},{"key":"bibr14-0706743720984684","unstructured":"Statistics Canada. Cannabis Statistics Hub; 2018. Available from: https:\/\/www150.statcan.gc.ca\/n1\/pub\/13-610-x\/cannabis-eng.htm (accessed April 27, 2020)."},{"key":"bibr15-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1111\/add.14209"},{"key":"bibr16-0706743720984684","doi-asserted-by":"publisher","DOI":"10.1080\/10826084.2019.1608249"},{"key":"bibr17-0706743720984684","unstructured":"Sant\u00e9 Canada. Comprendre le nouveau R\u00e8glement sur l\u2019acc\u00e8s au cannabis \u00e0 des fins m\u00e9dicales; 2016. Available from: https:\/\/www.canada.ca\/fr\/sante-canada\/services\/publications\/medicaments-et-produits-sante\/comprendre-nouveau-reglement-sur-acces-au-cannabis-fins-medicales.html (accessed October 16, 2020)."},{"key":"bibr18-0706743720984684","unstructured":"Statistics Canada. The Daily \u2014 StatsCannabis data availability: Crowdsourced cannabis prices, fourth quarter 2019; 2020. Available from: https:\/\/www150.statcan.gc.ca\/n1\/daily-quotidien\/200123\/dq200123c-eng.htm (accessed October 19, 2020)."}],"container-title":["The Canadian Journal of Psychiatry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0706743720984684","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/0706743720984684","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/0706743720984684","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T16:14:36Z","timestamp":1777392876000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/0706743720984684"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,2,11]]},"references-count":18,"journal-issue":{"issue":"12","published-print":{"date-parts":[[2021,12]]}},"alternative-id":["10.1177\/0706743720984684"],"URL":"https:\/\/doi.org\/10.1177\/0706743720984684","relation":{},"ISSN":["0706-7437","1497-0015"],"issn-type":[{"value":"0706-7437","type":"print"},{"value":"1497-0015","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,2,11]]}}}