Smoking is harmful to health but does not lead to virility, its main hazards include increasing the probability of cancer, damage to the cardiovascular, cerebral and respiratory tissues. 1. Increase the probability of cancer: Smoking can reduce the activity of natural killer cells in the human body, so it will weaken the body’s function of monitoring, eliminating and removing tumor cells. Therefore, the probability of cancer in smokers is much higher than that in non-smokers. 2. Damage to cardiovascular and cerebrovascular: Smoking is a risk factor for many cardiovascular and cerebrovascular diseases, especially coronary heart disease, hypertension, cerebrovascular disease and peripheral vascular disease, the incidence of which is higher than that of normal non-smokers. 3. Damage to the respiratory tract: long-term smoking may lead to damage to the cilia of the bronchial mucosa, which will affect its function, so smoking is one of the main triggering factors of chronic bronchitis and chronic airway obstruction Smoking is harmful to your health, so it is right to quit smoking as soon as possible. If you feel unwell, consult a doctor promptly.