{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T21:09:04Z","timestamp":1790716144656,"version":"4.1.0"},"reference-count":58,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T00:00:00Z","timestamp":1790553600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T00:00:00Z","timestamp":1790553600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"DOI":"10.13039\/501100000034","name":"Institute of Neurosciences, Mental Health and Addiction","doi-asserted-by":"publisher","award":["SMN-13950"],"award-info":[{"award-number":["SMN-13950"]}],"id":[{"id":"10.13039\/501100000034","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100021784","name":"Ministry of Colleges and Universities","doi-asserted-by":"publisher","award":["Ontario Graduate Scholarship"],"award-info":[{"award-number":["Ontario Graduate Scholarship"]}],"id":[{"id":"10.13039\/501100021784","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000024","name":"Canadian Institutes of Health Research","doi-asserted-by":"publisher","award":["170394"],"award-info":[{"award-number":["170394"]}],"id":[{"id":"10.13039\/501100000024","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Substance Use &amp; Addiction Journal"],"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Cannabis use increased among youth during the COVID-19 pandemic. However, there is a lack of research examining whether there were lasting changes in cannabis use and, in particular, problematic cannabis use, across the pandemic. This is particularly important to examine among young adults because problematic cannabis use is associated with a greater likelihood of impaired neurodevelopment and adverse health outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>The study was a longitudinal cohort survey of Canadian youth (n\u2009=\u20091579; 55% female; mean age 22\u2009years) aged 16 to 30 residing in Ontario who reported cannabis use in the past 3\u2009months. Respondents completed online questionnaires regarding their cannabis use once in 2022 and again in 2023. Linear regression examined the association between reporting increased cannabis use during the pandemic and changes in symptoms of cannabis use disorder (CUD) (measured by the Cannabis Use Disorder Identification Test\u2013Revised [CUDIT-R]). Models were adjusted for sociodemographic factors and psychological distress.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Linear regression indicated that increased cannabis use in response to the COVID-19 pandemic was significantly associated with increased CUDIT-R scores across survey waves (\u03b2: 1.49; 95% CI: 0.99, 2.00). The association between increased cannabis use and changes in symptoms of CUD was stronger for younger than older participants (\n                      <jats:italic toggle=\"yes\">P<\/jats:italic>\n                      \u2009=\u2009.04).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>The COVID-19 pandemic was associated with increasing symptoms of CUD, particularly among youth, even 3\u2009years after it was initially declared. This study highlights the importance of addressing the ongoing impacts of the COVID-19 pandemic and developing strategies to prevent hazardous substance use in future health crises.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/29767342261488975","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T09:11:21Z","timestamp":1790586681000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Changes in Symptoms of Cannabis Use Disorder of Ontario Youth Across the COVID-19 Pandemic: A Longitudinal Cohort Study"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-4194-8420","authenticated-orcid":false,"given":"Jessica","family":"Berryhill","sequence":"first","affiliation":[{"name":"School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ian","family":"Colman","sequence":"additional","affiliation":[{"name":"School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sameer","family":"Imtiaz","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Chaiton","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantha","family":"Wells","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"},{"name":"Department of Epidemiology and Biostatistics, Western University, London, ON, Canada"},{"name":"Dalla Lana School of Public Health, University of Toronto, ON, Canada"},{"name":"School of Psychology, Deakin University, Burwood, VIC, Australia"},{"name":"Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Rueda","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"},{"name":"Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mina","family":"Tadrous","sequence":"additional","affiliation":[{"name":"Leslie Dan Faculty of Pharmacy, University of Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hayley","family":"Hamilton","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Schwartz","sequence":"additional","affiliation":[{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"},{"name":"Dalla Lana School of Public Health, University of Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tara","family":"Elton-Marshall","sequence":"additional","affiliation":[{"name":"School of Epidemiology and Public Health, Faculty of Medicine, University of Ottawa, ON, Canada"},{"name":"Institute for Mental Health Policy Research and Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"key":"e_1_3_4_2_2","unstructured":"Health Canada. 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