Thanks for your question on Health Care Magic. I can understand your concern. In my opinion, you should get done chest x ray first. You are smoker since 25 years. And smokers have high possibility of lung Infection due to poor lung defense. And chest pain on coughing and deep breathing is characteristic of pleurisy (inflammation of pleura). Lung infection is the most common cause for pleurisy. So we need to rule out lung infection first. Chest x ray is needed for this. If chest x ray is normal then no need to worry for lung infection, you are mostly having musculoskeletal pain. Better to quit smoking as soon as possible. Avoid painful movements of heavyweight lifting. You may need painkiller and muscle relaxant drugs too. Since these are prescribed medicines, you need to consult doctor for this. Wish you good health. Thanks.