weed does affect the lungs as it is a pollutant to your lungs, but it isnt a carcinogen..if that makes sense.....weed doesnt cause you to develop cancer or black lung type diseases if that is what you are asking...anything not air you put into your airway hurts your lungs, that is common sense, but it is the amount you are worried about, and marijuana dosent kill you......

hope this helped some and yes, i am a healthcare professional...

in laymans terms i guess, happy toking...

princess
ickystkyme Reviewed by ickystkyme on . Someone who knows allot about lungs Hey i was wondering how bad it would be on ones lungs if they smoked weed once a week and nothing else. And it what if any effects would it have if u used to smoke cigs and weed everyday then suddenly quit smokeing cigs and just smoke weed once a week. Anyways i would rather someone who know a little bit about the human lungs to answer this because im in a situation. Ive been looking to an answer to this for last few day on the net and asking a shit load of people and all the answers i get Rating: 5