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Does Marijuana Cause Schizophrenia?


As legalization spreads throughout the developed world, the true health effects of cannabis are more important to understand than ever before. This video investigates a link between marijuana and the mental health disorder schizophrenia.

This video was made by McMaster Students Matthew Yanovski, Mohamed Gareiw, Syed Fowad Daud and Ihtisham Ahmad, in collaboration with the McMaster Demystifying Medicine Platform.

Subscribe to the McMaster Demystifying Medicine YouTube channel: https://www.youtube.com/c/DemystifyingMedicine

This video is provided for general and educational information only. Please consult your health care provider for Information about your health.

Special thanks to our guest narrators:
– Danial Qureshi
– Adhithya Krishnan

Copyright McMaster University 2021


Andréasson, S., Allebeck, P., Engström, A., & Rydberg, U. (1987). Cannabis and schizophrenia. A longitudinal study of Swedish conscripts. Lancet (London, England), 2(8574), 1483–1486. https://doi.org/10.1016/s0140-6736(87)92620-1

Andréasson, S., Allebeck, P., & Rydberg, U. (1989). Schizophrenia in users and nonusers of cannabis. Acta Psychiatrica Scandinavica, 79(5), 505–510. https://doi.org/10.1111/j.1600-0447.1989.tb10296.x

Radhakrishnan, R., Wilkinson, S. T., & D’Souza, D. C. (2014). Gone to Pot – A Review of the Association between Cannabis and Psychosis. Frontiers in psychiatry, 5, 54. https://doi.org/10.3389/fpsyt.2014.00054

van Os, J., Bak, M., Hanssen, M., Bijl, R. V., de Graaf, R., & Verdoux, H. (2002). Cannabis use and psychosis: a longitudinal population-based study. American journal of epidemiology, 156(4), 319–327. https://doi.org/10.1093/aje/kwf043

Siff, S. (2014).The illegalization of marijuana: A brief history. Origins, 7(8). https://origins.osu.edu/article/illegalization-marijuana-brief-history/page/0/1

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