yep, this one is utter bullshit. pas everyone on this site should know by now the worst thing weed does to your lungs is make it so you are short of breath quicker. and even if that is what this study is saying, that it is wworse than tobacco in that regard(which is not what its saying), as someone who runs every day i can personally say the breathing difference is much, much more noticeable in cigarettes than in weed, in that it is a lot harder to run if you smoked cigarettes the night before then compared to weed. i will say it is easiest if you dont smoke at all, but weed doesnt have any lasting damage to breathing i have noticed and the facts are in it simply is not bad for you lungs