$1:
The CMA said in the submission that ideally the legal limit would be 25, because the brain is still developing until about that age. But the group said a lower legal age is needed to keep youth from turning to criminals to buy pot.
Makes no sense to turn anybody into criminals. I don't hear about charges of 16 year olds being turned into criminals for drinking. The people who should be turned into criminals are the people selling to kids.
Sure let's make the age 21. Then let's raise the age for booze the same. See how that works out. And since tobacco is more harmful than either, it should be 21 too. That's the advantage the US states had legalizing - they already had a drinking age of 21, so matching pot didn't present a problem.