1. Influence on cardiovascular and cerebrovascular diseases: Smoking is an important inducement of cardiovascular and cerebrovascular diseases such as hypertension and coronary heart disease. Statistics show that 75% of patients with coronary heart disease and hypertension have a history of smoking. Nicotine and carbon monoxide in smoke are considered as harmful substances. Smoking can damage vascular endothelial cells, increase cholesterol, cause peripheral blood vessels and coronary arteries to contract, and cause myocardial hypoxia.
2. Impact on respiratory tract: Smoking is one of the main causes of chronic bronchitis, emphysema and chronic airway obstruction. The probability of smokers suffering from chronic bronchitis is 2-4 times higher than that of non-smokers. Patients often have chronic cough, expectoration and dyspnea during activities. Even young asymptomatic smokers have slight lung dysfunction.
3. Carcinogenesis: The cancer most directly related to smoking is lung cancer. If you smoke more than 35 cigarettes a day, the probability of developing lung cancer is 45 times that of non-smokers. Smoking will reduce the activity of natural killer cells, thus weakening the body's function of monitoring, killing and clearing tumor cells, which further explains why smoking is a high risk factor for many cancers.
Extended data
Tobacco smoke contains hundreds of harmful substances, among which 69 known carcinogens can directly cause oral and pharyngeal malignant tumors, laryngeal cancer, esophageal cancer, gastric cancer, liver cancer, pancreatic cancer, renal cancer, bladder cancer, cervical cancer and other cancers. In addition, smoking can lead to chronic obstructive pulmonary disease and cardiovascular and cerebrovascular diseases, which is one of the main causes of coronary heart disease, stroke, aortic aneurysm and peripheral vascular diseases, and also an independent risk factor for cardiovascular and cerebrovascular diseases.
Secondhand smoke exposure can also cause serious harm to the body, leading to lung cancer, respiratory diseases, cardiovascular and cerebrovascular diseases. Exposure of pregnant women to secondhand smoke can lead to birth weight loss, premature delivery and sudden infant death syndrome. The harm caused by children's exposure to second-hand smoke should not be underestimated.
People's Network-What harm will smoking bring?