Smoking is an unhealthy living habit, and its harm to human body is as follows:

brain

Smoking can cause various brain diseases, reduce oxygen and blood circulation in the brain, lead to cerebral vascular bleeding and occlusion, and lead to paralysis, mental decline and stroke. The cause of stroke is that smoking leads to cerebral vasospasm, which makes blood coagulation easier. Smokers are twice as likely to have a stroke as nonsmokers.

laryngeal

Smoking can cause laryngeal cancer. Laryngeal cancer patients are mostly male.

Heart and blood vessels

Smoking can cause fat accumulation and vascular occlusion, making smokers prone to coronary heart disease. The death rate of heart disease caused by smoking accounts for 25% of the total. The prevalence of smokers over 50 has doubled. The prevalence rate of smokers under 50 years old increased 9 times, reaching 14 times. Smoking will constrict blood vessels, slow down the circulation of blood and oxygen, and eventually lead to thickening of blood vessel walls, leading to coronary heart disease and stroke. Smoking will completely block the blood circulation of hands and feet, leading to amputation.

lung

Smoking can cause lung cancer. 90% of the total mortality rate is caused by smoking. The prevalence rate of a person who smokes ten cigarettes a day is ten times that of a non-smoker. Damaged cells can't return to normal. The initial symptoms will not be found until the cancer cells spread to blood vessels and other organs. Smoking can also cause emphysema, and toxic substances accumulated in the bronchi of the lungs will hinder the normal exhalation of the air inhaled by the human body, make lung cells expand or rupture, and cause patients to have difficulty breathing.

stomach

People with gastrointestinal diseases, smoking is enough to make gastrointestinal diseases worse. People with gastric ulcer or duodenal ulcer will slow down the healing of ulcer and even become chronic diseases. Smoking can stimulate the nervous system, accelerate the secretion of saliva and gastric juice, make the gastrointestinal tract often tense, and lead to the loss of appetite of smokers. In addition, nicotine can also contract gastrointestinal mucosal blood vessels and reduce appetite.

skeleton

The recovery period of fracture of smokers is longer than that of non-smokers. It may be that nicotine and carbon monoxide contained in cigarettes slow down the process of bone regeneration. Nicotine constricts blood vessels and reduces blood flow to new bones. The carbon monoxide inhaled during smoking also reduces the speed at which oxygen enters the body. Smoking can lead to osteitis and back pain. Smoking more than ten cigarettes a day will double the prevalence of periostitis. Most people with severe back pain are addicted to smoking, because smoking will reduce the blood flow of the articular disc and the articular disc will degenerate early. Smoking can lead to arthritis. Smoking a pack of cigarettes a day will increase the prevalence rate by 50%. Female smokers are more likely to suffer from fractures and arthropathy after menopause. Smoking will lead to faster bone loss. Women smoke a pack of cigarettes every day from adolescence to menopause, and their bones are 5% to 10% less than those of non-smokers. When smokers enter menopause, the bone loss rate is faster. Smoking can interfere with estrogen, which is an important hormone in bone development.

bronchus

Smoking is the main cause of chronic obstructive tracheal disease. Because smoking can cause the cilia of bronchial epithelial cells to become shorter and irregular, cause dyskinesia, reduce local resistance and be susceptible to infection.

liver

Smoking will increase the burden on the liver. Regular smoking will affect the lipid metabolism of the liver, increase blood lipid, decrease benign cholesterol and increase malignant cholesterol. This has caused the burden of detoxification function of the liver to increase.

intestines

Smoking can lead to colon cancer. The risk of this kind of cancer is directly proportional to the amount of smoking. Research shows that although quitting smoking can reduce the risk of heart disease, lung cancer and other diseases, the risk of colon cancer is still high.

ocular region

Smoking can lead to cataracts and affect vision. Research shows that there are twice as many cataract patients who smoke more than one pack a day as those who never smoke.

Secondhand smoke

Secondhand smoke is a kind of mixed smoke that is burned or exhaled by cigarettes, pipes or cigars when smokers smoke. Secondhand smoke is the most common pollutant in many smoking places. Smoke emitted during smoking can release more than 4,000 kinds of gases and particles, most of which are very strong irritants, and at least 40 of them can cause cancer in humans or animals. After smokers quit smoking, these particles can still stay in the air for several hours, can be inhaled by other non-smokers, and may be mixed with the decay products of radon gas, causing great harm to human health.

When smoking harms smokers' own health, second-hand smoke will also affect non-smokers. In addition to irritating eyes, nose and throat, it will significantly increase the risk of lung cancer and heart disease in non-smokers. If children live with some smokers, their respiratory system will be more susceptible to infection. Other symptoms include increased cough, asthma, excessive phlegm, impaired lung function and slow lung development.