Lung Cancer Condition_symptoms My Story's Main Character's Mother Is Sick With Lung Cancer. She Dies, But How Does She Die? Explain In Detail?

My story's main character's mother is sick with lung cancer. She dies, but how does she die? Explain in detail? - lung cancer condition_symptoms

How do people go to die of lung cancer? are the conditions, symptoms, and the things that led to the death. How did it come from lung cancer? (in addition to smoking and other drugs please) Help! Since Docter explained what happened, so I need an answer to a physician would.