text: i smoke a little over a pack a day......? and i have a sharp stabbing cramping feeling in one of my lungs everytime i breathe in. do i have a tumor? what else could it be? i do have asthma but i have no weasing and have never experienced this kind of pain with an asthma attack. its been going on for about three days now but doesnt hurt as bad as the first day. any sudden chest pain needs to be evaluated urgently.  one does not self diagnose major disease, even with the ertswhile assistance of yahoo ask.    only you can judge your own pain level.  if the pain increases as you take a deep breath it could be upper respitory, or it could be heart.  you are not qualified to judge nor do i hear or see any md responses.    do not wait, see a doc.  lung or heart, either could be potentially life threatening.     smoking or no smoking.