It's already so easy to get, that it might as well be legal. Save the prisons for the real criminals and generate some revenue for the government in the process. Legalizing it probably won't increase consumption that much...stoners now will be stoners if it's legal.

As for the person who got rearended by a stoned kid....well...it didn't really matter if it was legal or not, did it? Either way he was still stoned.

The only difference is that we don't need to waste public resources enforcing ineffective laws.

Maybe then, we can enforce the immigration laws instead.