Thanks for your question on Health Care Magic. I can understand your concern. By your history and description, possibility of musculoskeletal pain is more. But since you are smoker, we should also rule of pulmonary causes. So get done chest x ray and PFT (Pulmonary Function Test). If both these are normal then no need to worry for Pulmonary diseases. Your pain is mostly due to musculoskeletal cause. So avoid movements causing pain. Avoid heavyweight lifting and strenuous exercise. Loose weight and stay healthy and fit. Avoid bad postures in sleep. Take painkiller and muscle relaxant drugs. Apply warm water pad on affected areas. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.