Smoking can lead to poor airway circulation, increased secretions in the trachea, injury to the lungs, resulting in an increased incidence of chronic obstructive pulmonary disease, and an increase in asthma and tuberculosis disease in adolescents. At the same time, tobacco contains a large number of carcinogenic substances, which can cause mutations of key genes in the body and dysregulate the normal growth and control mechanisms, leading to cell carcinogenesis and malignant tumors. Such as lung cancer, nasopharyngeal cancer, esophageal cancer and other diseases. Smoking can cause coronary artery sclerosis, resulting in the occurrence of cardiovascular disease, which is the biggest cause of coronary heart disease. Smoking can also cause a decline in fertility, resulting in premature fetal birth, stunted growth and other symptoms. Smoking is harmful but not beneficial. For the sake of family and personal health, it is recommended to quit smoking as soon as possible. At the same time, you can eat more lung-clearing foods, such as yams, lilies, loquats, etc. have a lung-clearing effect.