Unfortunately, you do not have to be a smoker to get lung cancer. If I were you I would just remain as calm as possible, and do as your doctor has suggested to you. Play it safe. Should, and I am not saying that you do, it be cancerous, it may have been caught early. Which is generally better. Years ago I had done a lot of research for an assignment, and lung cancer does not mean a 'death sentence,' there are five lobes in each lung. Stay positive. And good luck.