Larry, I would suggest scans every 6 mos. I am a breast cancer survivor. Mine was found because of scans every 6 mos. I had one nodule and a wedge resection. 6 mos. later, 2 more nodules were visible but too small to biopsy. I am now getting a scan every 3 mos. waiting for them to be large enough to biopsy. My next scans are next week. I too am a former smoker but only quit 8 yrs ago. Before I can have treatment, they need to determine if it is lung cancer or breast cancer since I have had both.