Once they have your head, everything else will fall into line.
Consider how it actually became illegal. Alcohol lobbiests prevailed upon legislators to ban the profit reducing competition. Consider how it became such a dangerous drug. Nixon was afraid of the blacks, and it was imagined that a war on drugs would help. But without marijuana included, the statistics could never be high enough to warrant the vast expense.
Whatever you believe to be the justification now, we were lied to and manipulated into surrendering the manifest right to the control of our own heads, by people with nothing more honorable than greed and racism as a motivation.
Congrats to Canada for even getting this into public discourse, and good luck with reason ultimately winning out.