Hi, Brief Answer: There are many conditions that could cause the density you described, with lung cancer being one possibility. Detailed Answer: In my opinion, the density you described is likely what is referred to as a solitary pulmonary nodule. This nodule could be lung cancer, but it can also have a noncancerous cause. These noncancerous (or benign) causes include impacted mucous plug in your airways related to your bronchitis, infection from a fungus or tuberculosis, disorganized but normal lung tissue (called a hamartoma), abnormal blood vessel formation, and an enlarged lymph node. Smoking is a risk factor for lung cancer and this risk increases based on how many cigarettes you smoke on a daily basis and for how many years you smoke. Your doctors want to image your lungs again to determine if the density seen on the chest x-ray grows in size or changes in appearance over the next 6 months. If necessary, additional tests may be performed, including getting a tissue sample of the lung. I have recommended the same plan of care for similar patients. In my opinion it would be best if you stopped smoking. Quitting smoking will decrease your risk of lung and other cancers as well as decrease your risk of lung disease and heart disease. Quitting smoking is probably the best thing that you can do for your overall health. There are many therapies to help patients quit smoking and your doctor will be able to help you with this. Please feel free to follow up with me in 6 months or sooner if you wish. If you have any additional questions, please do not hesitate to ask. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Aaron Shapiro