Good for them, I guess. I never understood what the big deal was. Personally I don't smoke, but I've never been opposed to people that do so long as they keep that shit away from me and out of places where it shouldn't be.
I share Darksol's position and hope legalizing will turn out to be a good choice for them. It will certainly hinder the black market in some way, but saying that it will prevent youth from having access to pot is incredibly naive or just a deliberate lie.
The main source of weed here in Canada before legalization is illegal dealers, now that it's level and tightly regulated the availability of it drops a lot. Th profit in selling it illegally should also drop a large amount do to legal supply been far more beneficial then off a dealer. This leads to drop in illegal sellers and supply going into youth hands.
Yes, as I said the general illegal market will drop, but the only way for teens to buy it will still be illegally, so that part of the market will survive, like an illegal niche if you want. That is if they don't find ways to access the legal stuff anyway, as they do with alcohol in the US. For example, this report from Colorado, made after 5 years from the legalization there, points out that "[regarding teen consumption] we've seen almost statistically flatline use [...] for the past decade."
Yea even here in Canada the only talk of it you'll really see is the to hundreds of memes about legalisation