well, smoking is bad, and will cause harm regaurdless of what substance it comes from... does that mean it's nessicarily directly related to cannabis just because they haven't smoked anything else in their life? no... it's just directly related to the smoking. if you're worried about your lungs, eat it or vape it. just don't smoke for years and expect your lungs to be healthy then turn around and start spewing neandrethalic crap that furthers the cause against marijuana....

the joints didn't roll themselves, jump in your mouth, light themselves and make you smoke 'em. you chose to smoke, so accept the consequences.