Hi and thanks for using this panel for your health concerns. I am sorry about what yo are going through right now. I understand your fears and worries, they are genuine and every other person would react like you Density in the lung fields can mean so many different things. What is the size of this density? how are the borders? etc are more informations needed that guide us to give more informative answers. It can be benign lesion as well as a more concerning one. Given the fact that you have been smoking, though not heavily, your doctor is requesting the CT scan to make sure he s not missing out on something dangerous. Also, if you have ever done chest xrays in the past, you may want to take these films in so that the radiologist can compare to see if this nodule is new or not. Keep calm. When you get the final exams which may even include biopsy after the CT scan if needed, you would get the definitive answer. Unless we get these investigations, all we can suggest are a list of possibilities that will not make any big change. Smoking, though loved by many, has far reaching health consequences. If you would like to consider stopping, then please discuss this with your doctor. There are many resources that can help you to stop. Hope this helps at least, conclusive answers can only be gotten when the investigations are completed. Wish you good health.