Eric, not everyone who smokes is a pot head.
Cigarettes, alcohol, and even pop (sugar and caffeine, can be very addictive) are every bit as much of a 'drug' as weed is.
Everything is not so black and white. Weed is only a 'bad drug' because the government and nanny's says it is.
You'd be surprised about people who smoke weed on an occasional basis. They can be productive members of society too. There is no good reason for pot to be illegal, especially considering that alcohol and cigarettes are legal.
P.S. I'm sure you think I don't smoke weed, and you are right. Partially only due to laws and mostly because it's not worth the possibility of losing a job. Otherwise, yes I would probably be an occasional smoker. Just like I occasionally smoke a hookah or a cigar, which is on average probably once every six months. I know that those are (physiologically) bad for me and that's why I don't do them more often.