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This study uses an innovative digital citizen science approach to determine the association between Cannabis use and suicidal ideation among youth while investigating how school health policies mediate this association.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec002\">\n<jats:title>Methods<\/jats:title>\n<jats:p>The study engaged 818 youth (aged 13\u201318 years) and 27 educators as citizen scientists via their own smartphones. Youths responded to time-triggered validated surveys and ecological momentary assessments to report on a complex set of health behaviours and outcomes. Similarly, educators\u2019 reported on substance misuse and mental health school policies and programs. Multivariable logistic regression modeling and mediation analyses were employed.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec003\">\n<jats:title>Results<\/jats:title>\n<jats:p>412 youth provided data on substance misuse and suicidal ideation. Cannabis use and other factors such as bullying, other illicit drug use, and youth who identified as females or other gender were associated with increased suicidal ideation. However, school policies and programs for substance misuse prevention did not mediate the association between Cannabis use and suicidal ideation.<\/jats:p>\n<\/jats:sec>\n<jats:sec id=\"sec004\">\n<jats:title>Conclusions<\/jats:title>\n<jats:p>In the digital age, it is critical to reimagine the role of schools in health policy interventions. Digital citizen science not only provides an opportunity to democratize school policymaking and implementation processes, but also provides a voice to vulnerable youth.<\/jats:p>\n<\/jats:sec>","DOI":"10.1371\/journal.pone.0263533","type":"journal-article","created":{"date-parts":[[2022,2,14]],"date-time":"2022-02-14T18:37:29Z","timestamp":1644863849000},"page":"e0263533","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":10,"title":["Cannabis use and suicidal ideation among youth: Can we democratize school policies using digital citizen science?"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5765-1435","authenticated-orcid":true,"given":"Tarun Reddy","family":"Katapally","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,2,14]]},"reference":[{"key":"pone.0263533.ref001","doi-asserted-by":"crossref","first-page":"881","DOI":"10.1016\/S0140-6736(09)60741-8","article-title":"Global patterns of mortality in young people: a systematic analysis of population health data","volume":"374","author":"GC Patton","year":"2009","journal-title":"Lancet"},{"key":"pone.0263533.ref002","doi-asserted-by":"crossref","DOI":"10.3389\/fpsyt.2013.00125","article-title":"The Association between Cannabis Use, Mental Illness, and Suicidal Behavior: What is the Role of Hopelessness?","volume":"4","author":"G Serafini","year":"2013","journal-title":"Front Psychiatry"},{"key":"pone.0263533.ref003","doi-asserted-by":"crossref","first-page":"576","DOI":"10.1100\/tsw.2005.79","article-title":"Cannabis and Suicidal Behaviour Among Adolescents: A Pilot Study from Trinidad","volume":"5","author":"HD Maharajh","year":"2005","journal-title":"Sci World J"},{"key":"pone.0263533.ref004","first-page":"3","article-title":"Analysis of trends in the prevalence of cannabis use and related metrics in Canada","volume":"30","author":"M. 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