Even if it is bad for you, any argument against it being legal is basically an argument alcohol shouldn't be legal. Since alcohol is way worse for you.
I don't think this would apply to America because we have a huge underclass but in the right societal structure I think every drug should be legal. This would ruin the black market and make treatment much easier. But I don't think it would work in this country.
90% of the social drinkers I know are successful in both business and personal life
90% of the social pot smokers I know are useless fucks.
Not very scientific, but it's true.