@cathleenmc - good afternoon. I'm butting in because thinking that because you aren't a smoker disqualifies you from getting lung cancer. As the saying goes, if you have lungs, you can get lung cancer.
Since a nodule was found I suggest that you make an appointment with a pulmonologist to rule out lung cancer.
I do hope that your doctor is correct but if you haven't had a CT scan he can't know that.