Home » QAQuick Answer: What Happens If Mucus Stays In Your Lungs?ContentsHow long can mucus stay in lungs?How do you get drainage out of your lungs?Can you drown from mucus in lungs?Is mucus in lungs normal?How long can mucus stay in lungs?.How do you get drainage out of your lungs?Can you drown from mucus in lungs?Is mucus in lungs normal?