Thanks for your question on Health Care Magic. I can understand your concern. In my opinion, you should get done PFT (Pulmonary Function Test) to rule out bronchitis. Bronchitis is inflammation of bronchi and it is common in smokers. Cigarette smoke causes persistent irritation and inflammation of bronchi. These cause chest tightness, coughing etc. So better to get done PFT. It will also tell you about severity of the disease. And treatment of bronchitis is based on severity only. You may need inhaled bronchodilators and antihistamine drugs. And for your lung nodule, you have to get done follow up CT scan after 6-9 months to see for nodule size. If size is static or decreasing then no need to worry but if size is increasing then you need biopsy to rule out cancer. Your back pain is mostly due to muscular strain because of lifting your baby. So get done PFT and start treatment accordingly for your chest tightness and coughing. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.