I’m sorry for your suffering with health issues, it’s seems to be a way of life for many seniors, myself included. I don’t think that the scar in your lung turned into cancer, I’ve never found any research saying that this is so, most people have scarring in their lungs usually caused by infections, also lung nodules are extremely common and usually not cancer but sometimes they are, this was the case with me on two occasions. Whatever the primary cause was for getting cancer you will get the help you need to move forward, it’s shocking to read how many people young and old are going through this, our environment is poor and lung cancer cases are going up, sadly many more are affecting the younger generations, good luck with your recovery.