in 200-400 words,Why/how would an individual who never smoked and led an extremely healthy lifestyle be diagnosed with terminal lung cancer?

in 200-400 words,Why/how would an individual who never smoked and led an extremely healthy lifestyle be diagnosed with terminal lung cancer? To answer this question you must explore the stages of cancer formation and, if/how the body’s immune system deals with abnormal/precancerous cells. With your new knowledge can you explain why doctors recommend not smoking to reduce the chances of getting lung cancer?