If you have coughing symptoms from frequent smoking, be alert to the following three diseases: 1, chronic bronchitis, smoking is one of the main causes of chronic bronchitis, bronchial tubes under the long-term stimulation of tobacco produce chronic damage, forming chronic inflammation, chronic bronchitis cough is mainly characterized by repeated coughing, coughing sputum, mostly white mucus sputum, often with the onset of winter and spring, about three months per year. 2. Bronchial lung cancer. Smoking is a high incidence factor of lung cancer, and smokers with recurrent long-term cough, especially irritating dry cough, should be alert to the possibility of lung cancer. The persistent cough caused by lung cancer cannot be relieved and is progressively aggravated, sometimes accompanied by blood in the sputum or even chest pain.3. Cough variant asthma, smoking can induce acute attacks of cough variant asthma, mostly paroxysmal coughing, which is obvious at night, and some can also appear chest tightness or wheezing symptoms. Therefore, if you often smoke and have cough symptoms, you should seek medical attention and improve the appropriate tests to clarify and take targeted treatment.