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Frequent Cannabis Use and Cessation of Injection of Opioids, Vancouver, Canada, 2005-2018 

Reddon H, DeBeck K, Socias ME, et al. 

[published online ahead of print, 2020 Aug 20]. Am J Public Health. 2020;e1-e8. doi:10.2105/AJPH.2020.305825

https://pubmed.ncbi.nlm.nih.gov/32816538/