Hey there. Im a 20 year old female. I've been smoking for 3 years now. Recently i've been smoking 20 cigarettes a day and lately i have trouble breathing and im having a mucus cough. When i wake up in The morning i breathe normally and my cough is very minimal, but after dinner time my breathing and coughing is extreme. I just quit smoking, but im very paranoid about these symptoms. I dont know if im really sick and im so afraid i cant even sleep at night.