i went to the doctor for a physical and let him know that i was having shortness of breath and pain in chest,he told me that it was likely a respiratory problem. i do smoke and am worried about it being a tumor or whatever would it be regarding lung cancer. he did prescribe antibiotics and said it was likely an infection. I understand that many things can be found in the lungs. I am worried thouh because he did say the c (cancer) word. how worried should i be or is this a question that just cannot professionally or reasonably be answered. Can you relieve my extreme anxiety about this at all. I expect an honest professional and ethical answer. I am prepared for a negative or positive answer based on the info. i have told you. thank you very much.