Well, anything you smoke isnt good cause you have all the tar and stuff no matter what. The good thing about marijuana is that it is usually more natural than cigarettes and stuff. Cig companys add all sorts of chemicals and stuff that cant be good for your lungs. If you smoke bud though out of bongs and vaporizers it is definately more healthy. Even if it was bad for you to smoke if you do it every once in a while it really wont be that noticable, especially while you are young.