The reasons for chest congestion after smoking are as follows: 1, respiratory diseases: for example, patients with chronic bronchitis or the presence of bronchial asthma can experience chest congestion after smoking. Because tobacco can produce a variety of harmful fumes and gases during the burning process, which can induce acute attacks of bronchial asthma and acute attacks of chronic bronchitis; 2. Heart diseases: such as having severe coronary heart disease, dilated cardiomyopathy, pericardial effusion, etc. Smoking is only a causative factor, so if chest congestion occurs after smoking, it is important to improve lung CT, lung function, cardiac ultrasound, myocardial enzyme profile and other related examinations in a timely manner so as to clarify.