I would assume that folks who believe in States' rights wouldn't make an exception for a pet issue they may or may not agree with. But then again, look at the anti-smoking nazis. They are for personal property rights (aka business owners or homeowners) and yet when it comes to their own personal agenda, they vote to have those rights abolished. Never has the word "hypocrit" been more clearly defined.
It's not so much a question of states' rights. It's a question of enumerated Federal powers. But it's a moot point because that argument was already lost.
But then again, look at the anti-smoking nazis.
By anti-smoking nazis I assume you mean people who vote to restrict smoking in public places? I don't get what that has to do with this issue at all. It's certainly not a "states rights" issue, since the cigarette laws are state laws.
The question with pot isn't where you can smoke it, but CAN you smoke it.