I have said abroad that "it is not a dream to live to a hundred years old". I happened to see a program of China CCTV on the evening of May 30th this year. The content is that the United Nations Health Organization designated May 3 1 as World No Tobacco Day with the slogan "Quitting smoking is good for health". It is mentioned in the program that 1 1 100 million people smoke all over the world, and more than 4 million people worldwide die from smoking every year. According to statistics, the number of smoking deaths in the United States is 420,000 every year. It can be seen that smoking also shortens people's life span. How harmful is smoking to human body? Smoking is a special hobby of some people. Because it can directly act on the heart after entering the human body, it has different degrees of damage to the respiratory nerve, cardiovascular, digestive and urinary organs of the human body. Long-term smoking can lead to many diseases. Ancient famous doctors talked about the harm of smoking to human body: the ancients thought that tobacco was a spicy and harmful thing, which was harmful to human body, consuming energy and losing life. Qin 'an Herbal Medicine in Ming Dynasty pointed out: "Tobacco is pungent and poisonous". The Qing dynasty health monograph "ancient and modern words and food" said: "tobacco tastes pungent and dry, smoking consumes essence ... so it makes you drunk." It is also believed that "its intake is not constant, but all in an instant, which makes the whole body fast, sobers you up and makes you awake for life …" The ancients thought that smoking grass can "make the whole body fast" and "never get tired". Therefore, it is more harmful to the human body, and people often suffer from it unconsciously. Most people know that smoking can be fatal. They also know that smoking can lead to heart disease, stroke, upper respiratory tract infection and lung cancer. But how can smoking cause these deadly diseases? Br> The research of modern scientists has completely confirmed this point. 1. Chronic obstructive pulmonary disease: Symptoms include dyspnea, cough, expectoration and wheezing. Let's talk about human lungs first. When we inhale, air enters our lungs from our nose and mouth through the trachea. The trachea is divided into left and right bronchi, which enter the left and right lungs respectively. Air enters bronchi, bronchioles and finally alveoli. In the alveoli, oxygen will penetrate into the blood and be brought to all parts of our body by the blood. At the same time, the carbon dioxide in the blood is also discharged from our blood and excreted with our breath. Smoking is the main cause of all these diseases. Due to long-term heavy smoking, the trachea is in an inflammatory state for a long time, the cilia on the trachea wall are destroyed, the function of expectoration is reduced, the cells on the surface of the trachea are increased due to inflammation swelling and decomposition, and the amount of pus is increased, further blocking the trachea, making it difficult for air to enter and carbon dioxide to be discharged. Pulmonary alveoli swell, forming emphysema and further developing into pulmonary heart disease. A little activity will make it difficult to breathe and pant. Every cold will get worse and eventually die. 2. How does smoking cause a stroke? First of all, we should understand that every cigarette contains the following chemicals (toxins): A. Nicotine: a chemical that is as addictive as heroin and cocaine. When you smoke, nicotine can enter your brain in only 10 seconds, which makes your heart beat faster, increases your risk of heart disease and causes withdrawal symptoms when you don't smoke. B carbon monoxide: harmful gases emitted by automobiles can replace 65,438+05% of oxygen transported by red blood cells in human body, causing asthma and exhaustion. Carbon monoxide can also damage the inner wall of blood vessels, leading to the aggravation of atherosclerosis, fat deposition on the blood vessel wall, aggravating blood vessel obstruction and increasing the possibility of heart disease outbreak. Tar: A substance used for paving roads. Tar contains many carcinogens and other chemicals. Including acetone, DDT, arsenic (a poison), formaldehyde, ammonia and other 4000 kinds of harmful substances and carcinogens. Smoking will aggravate atherosclerosis and fat deposition in blood vessels, thus narrowing and blocking blood vessels. If the cerebral vessels are blocked, the supplied peripheral brain cells will die, leading to a stroke. 3. How does smoking cause heart disease? When the coronary artery supplying the heart is blocked and the blood supply to the myocardium is cut off, the surrounding tissues will be necrotic, which will lead to the outbreak of coronary heart disease and myocardial infarction in smokers. 4. How does smoking cause lung cancer? Smoking damages lung cells, that is, P53 gene. In every lung cell composed of DNA, there is a gene that can prevent cancer and prevent cancer from spreading. This negative protective gene is called P53, and its main function is to prevent cancer. Medical research shows that benzopyrene, one of carcinogens in cigarette smoke, can directly invade and damage P53 gene. When P53 gene in lung cells is damaged, malignant tumor will begin to grow. Smoking will aggravate your existing diseases and delay your recovery. If you are a patient, smoking will weaken your immune system and delay your recovery. Smokers are more likely to have complications during or after surgery than nonsmokers. If you have asthma or heart disease, smoking will aggravate the condition. 6. Smoking will pollute the environment. When you walk into a house where people smoke for a long time, although no one smokes now, you can still smell disgusting smoke, and you can't stay any longer. Smoke can be absorbed and stored by buildings, which is harmful to human health. Therefore, it is absolutely necessary to ban smoking in the office environment. Personally, I feel this way. 7. The harm of smoking to the health of others. Cigarettes contain a variety of poisons, and non-smokers smell smoke as harmful to their health as smokers. 8. The harm of smoking to teenagers. In an article published on World No Tobacco Day on 3 1 May, 2002, the Singapore government pointed out: "The bad habit of smoking begins in childhood. According to a survey, a quarter of middle school students smoke or try to smoke, and it is difficult for them to quit smoking after they become addicted. " The article said: "The main reason why most middle school students smoke is curiosity and fun. They don't know that nicotine will invade their brains as long as 10 seconds after smoking the first cigarette, making them feel excited and then unable to extricate themselves. Once addicted, smoking is no longer curious. The survey shows that more than half of the families with mothers, fathers or both smoke, and more than 1/3 of the brothers and sisters smoke; Close friends smoke more than 55%. Although students who smoke come from different backgrounds, the social environment has a great influence on them. Therefore, parents who smoke should pay special attention to quitting smoking for the health of their children. 9. How can smoking be addictive? Medical experiments show that nicotine directly enters your brain, so it has a strong influence on your psychology and physiology. Nicotine can stimulate your brain and release some chemicals that make you feel happy, but the feeling of smoking makes you addicted. This feeling won't last long, but it is only temporary. Later, in order to meet the needs of this feeling, you have to light the next cigarette. If you don't smoke in time, you will feel impatient because of addiction. Over time, your demand for cigarettes will increase day by day.