Is smoking harmful to health?

Of course, it is harmful: 1) the heart rate is accelerated and the blood pressure is increased; 2) cough; 3) Decreased vital capacity and poor breathing; 4) The temperature of fingers, toes and skin decreases; 5) Increased gastric acid; 6) Finger trembling; 7) Decreased urine; 8) Loss of appetite, taste and smell; 9) Dizziness and watery eyes; 10) reducing memory smoking can affect many parts of the body, and the most direct effects are mainly two systems: the respiratory system and the circulatory system. (1) Respiratory system 1) Smoking can damage lung function, sputum and toxic substances cannot be eliminated, and bacteria are easy to multiply. Under long-term stimulation, chronic bronchitis and chronic respiratory obstruction are formed, which can further develop into emphysema and coronary heart disease. 2) A large number of carcinogens in tobacco tar adhere to the respiratory tract, which can cause cancers in various parts of the respiratory tract under long-term stimulation, mainly lung cancer, and others include oral cancer, lip cancer and laryngeal cancer. (2) The influence of smoking on the circulatory system 1) Nicotine in cigarettes can accelerate the heart rate, and at the same time make blood vessels contract, which leads to an increase in blood pressure; 2) Long-term contraction of blood vessels leads to hardening of blood vessels, narrowing of lumen and reduction of blood delivery; 3) After coronary artery sclerosis, myocardial oxygen supply decreases, myocardial cells degenerate and die, leading to coronary heart disease; 4) Arterial vascular sclerosis of nutritional brain cells, weakening of vascular wall elasticity, can induce cerebral vascular rupture and bleeding, narrowing of lumen, and even cerebral thrombosis and cerebral embolism, leading to "cerebral stroke"; 5) Continuous inhalation of a large amount of carbon monoxide can make the body anoxic, which can aggravate the above lesions. . Nicotine is a volatile and highly toxic liquid, which can be absorbed by the human body through the mouth, nose, bronchi and gastric mucosa, resulting in neurological changes, rapid heartbeat, insomnia, hypertension, visual impairment, ulcers and other symptoms. Tobacco tar is a carcinogen produced by tobacco burning. When it accumulates in the lungs, it can gradually change the genetic structure of cells and turn normal cells into cancer cells. Carbon monoxide is also a toxic gas, which destroys the ability of blood to transport oxygen and makes various organs, especially the heart and brain, suffer from hypoxia. The harm of smoking to human body is chronic, and acute poisoning will not occur under normal circumstances. However, a variety of poisons that act on the human body for a long time will lead to a series of diseases such as emphysema, coronary heart disease, brain atrophy, gastric ulcer and even gastric cancer.