Your concern is understandable. My mother died at age 58 from lung cancer and my cousin on my mother's side at 54 of the same. You mentioned "My family physician wants to take a watch and see approach". Is that a Family Medicine or Internal Medicine doctor? If so, and your insurance allows you, seek out a Specialist (Pulmonologist). Check their background and look for one that treats lung nodules and/or lung cancer because not all of them do. Have you read the radiologist's report? Those reports can contain recommendations on follow up. I had an abnormal chest x-ray at urgent care and the report recommended a CT scan. I made an appointment directly with Pulmonologist and skipped my primary care provider- the CT scan report recommended PET scan. I did have lung cancer. My only symptom was recent shortness of breath which could also be attributed to a heart issue. I always look for a specialist for specific health issues. Medicine is a large subject, and it is important to see the knowledgeable experienced doctor with the right training.