Hi.... Welcome to healthcare magic. As per your complain you have problem of chest pain that may be because of lung infection or other condition. Mention your complete blood cell count. Auscaltation of respiratory sound helpful in diagnosis. Take a chest x ray to check any lung consolidation or pneumonia like condition. You are doing smoking and tobacco chewing so more chanse to damage a lung. Consult a pulmonologist for further diagnosis . Pulmonary function test and physical examination give exact idea. Start a treatment according to cause. I hope my guidance helpful to you.. Take care. Thank you. Dr Rachana R Goswami.