Smoking weed isn't as "bad" compared to smoking cigarettes. But in the long term, it will do some damage. But smoking like an ounce of weed a month compared to a pack of cigs a month, is a big difference; safer.
But still? Why would you do it? It's just retarded. And it smells worse than cow dung
*EDIT* Or should I say a pound of weed? Hmmmm...I don't know, I don't do this crap. An ounce a month sounds kind of low to me

Something like that though.