###Human: I have shallow breathing and wheezing with a history of smoking. Please help. ###Assistant: Hi. I can understand your concern. By your history and description, the possibility of bronchitis is more likely. It is commonly seen with smokers. It is the inflammation of airways. This inflammation causes bronchospasm which inturn causes wheezing, breathlessness, mucus production, etc. So please let me know, how many cigarettes you smoke in a day? Have you ever undergone a chest x-ray and PFT (pulmonary function test)?