There is a whole list of items that certain states regulate more heavily than others.
Alcohol
Tobacco
Firearms
Fireworks
Pornography
Gambling
Prostitution
etc.
Marijuana would just be one more item on the list. I think that many people who oppose legalization are closeted Puritans that if they could would ban alcohol and tobacco. They desire to force others to live by the same strict moral code that they do. A sort of Victorian morality with an excessive amount of snobbery and prudery.
I tend to prefer a live and let live moral code, where negative behavior is handled/corrected through social ostracism instead of the heavy and expensive hand of government which ultimately limits the liberty of all Americans.
I completely agree. Adults treating adults like equals, not moral superior/inferiors. I resent any government that thinks that it has a right to be my conscience no matter which side of the fence -- Liberal or Conservative -- they are on. I have a conscience of my own that I am answerable to God for, and no government has the right play intermediary, whether to fleece my pockets or force some puritanical nonsense down my throat.
And I agree that this (social acceptance/ostracism) is where social conservatism really belongs -- in the social realm, not the government realm.