Recommended reading, from 2017:

The Peter Boris Centre for Addictions Research McMaster University Cannabis Law Reform in Canada: Pretense & Perils: 

https://fhs.mcmaster.ca/pbcar/documents/Pretense%20&%20Perils%20FINAL.PDF

It's pro-legalization, but talks more about the true drug perils of today: Alcohol, Tobacco and Pharmaceuticals (the cause to the opiate problems), the associated industries, our failed regulatory body - and a lot more!