Smoking too much can cause different degrees of damage to the human body, especially prone to some diseases of the respiratory system. Because tobacco contains a large number of harmful components, such as tar, nicotine, etc., but also contains incomplete combustion may produce carbon monoxide. If you smoke too much, it is easy to lead to deformation of the bronchial mucosa, forming a chronic inflammatory response, leading to, for example, chronic bronchitis, chronic obstructive pulmonary emphysema, etc., and can also lead to chronic pharyngitis. And more serious will lead to some cancer of the lung, such as bronchial lung cancer, alveolar cell carcinoma, etc.. And too much inhalation of carbon monoxide may also cause the lungs to inhale too much gas without oxygen, and hypercapnia and hypoxemia, causing respiratory failure, and even carbon monoxide poisoning.