Pot is not physically addictive.

Its addictive in the way that some people say CF is addictive. But, that's hardly the same thing. If you were going to say that anything enjoyable constitutes as addictive then all games, the internet in general, television and etc should all be added to the list.

That being said, if you have a shred of willpower, you won't get addicted to pot.

I don't disagree with what you're saying, I don't think it'll be legal for reason 1. Basically, there's too much social stigma riding on it. And its not because of people growing their own, its because your grandfather and probably father have very large dislikes for pot smokers. Along with a healthy chunk of those generations.