There are very many benefits of not smoking, because compared to people who smoke, non-smokers are less prone to diseases such as chronic bronchitis, bronchial asthma and wheezing bronchitis, chronic pharyngitis, rhinitis, and malignant tumors of the lung, including bronchopulmonary cancer and alveolar cell carcinoma. Tobacco contains a large amount of soot, dust, and chemical substances, including tar and nicotine, which are easily deposited in the respiratory tract, causing damage to the mucous membrane of the respiratory tract and even degeneration, resulting in a chronic inflammatory response. These substances also tend to stimulate the mucous membrane of the respiratory tract to develop malignant changes, leading to the occurrence of lung cancer, so not smoking can prevent these diseases of the respiratory tract mentioned above.