As long as smoking will appear sputum coughing out in the clinic is more common is smoking and lead to chronic bronchitis, this is due to the tobacco contains very much harmful substances, such as tar, nicotine, etc., can make the bronchial mucous membrane denaturation and make its elasticity decreased, and there is a large amount of inflammatory secretion exudation, congestion, edema, airway obstruction. Especially tobacco chemicals stimulate the pharynx will lead to frequent pathological states, so a cigarette will be sputum coughing, if long-term chronic inflammation is getting worse, will lead to chronic obstructive pulmonary emphysema or even cause chronic pulmonary heart disease.