There are many bad effects of smoking, such as harming the cardiovascular, genitourinary and respiratory systems, etc. It will also pollute the surrounding environment, and at the same time jeopardize other people’s health. 1. Cardiovascular and cerebrovascular hazards: smoking can induce cardiovascular disease, and cigarettes contain nicotine and nicotine and other components, will cause damage to the endothelium of the blood vessels, leading to arteriosclerosis, thus causing vascular spasm or plaque, inducing angina pectoris, myocardial infarction, hypertension, coronary heart disease, cerebral infarction, cerebral hemorrhage and so on. 2. Genitourinary hazards: smoking and prostate diseases have a certain relationship, which will affect the sperm activity, but also affect the sex life. 3. Respiratory hazards: mainly because smoking will cause damage to the respiratory system, leading to chronic bronchitis, chronic laryngitis, chronic obstructive pulmonary disease, lung cancer and so on. 4. Harmful effects of smoking on the surrounding environment: its smoke will make the family members inhale second-hand smoke, which will cause harm to the body of others. In addition, smoking will also lower the body’s immunity, thus triggering allergies or certain infectious diseases, thus causing harm to the body, so pay attention to quit smoking.