Clearing The Air: A Summary of Evidence

This report was published by the Ontario Centre of Excellence for Child and Youth Mental Health.

In this document, we examine the links between mental health and substance use, particularly cannabis use among youth under 25 years of age. We summarize expert opinions as well as the results of a non-systematic search of the research and grey literature available at the time of writing, with the caveat that knowledge on evidence-informed practices will continue to evolve over time. While this report describes best practices or elements of evidence-informed programs, we do not endorse a practice or program. Further, since the literature summarized here represents only one type of evidence, our next steps will integrate these findings with insights from mental health and addictions service providers along with the experiences of children, youth, and families into a learning resource.

See also Clearing The Air: Informing Conversations About Cannabis For Child And Youth Mental Health And Addictions Service Providers.


Ontario Centre of Excellence for Child and Youth Mental Health. (2019). Clearing The Air: A Summary of Evidence. Ottawa, ON: Author. Retrieved from

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