My lungs hurt if I overexceed lung compacity during a run or a bike ride.Really I don't get to smoke alot cause I just started a new job,new area,and don't have a steady dealer and can't grow.But on a seriuse note,not that ur lungs might be on the fritz, a good site to go to is web M.D. Just for anything that might worry u.Not to say that these fine folks ideas aren't great.Just might help better.I don't think pot is as bad as cigar or cig smoking though.