At present, there are 360 million smokers in China, and 740 million people are exposed to secondhand smoke. Smoking is a high risk factor for cancer. There are thousands of chemicals, hundreds of harmful substances and 69 definite carcinogens in tobacco. Whether active or passive smoking, smoking is the number one killer of lung cancer. Lung cancer has the highest incidence and mortality among all tumors.
These harmful chemical factors in tobacco will stimulate our bronchial mucosa, cause mucosal malignant transformation, and seriously lead to cancer. Smoke is also harmful to the body, not only causing harm, but also causing great harm to the human trachea. It is the main cause of chronic obstructive pulmonary disease and chronic bronchitis. In addition, smog poisoning also affects the heart.
1. Nicotine: Make smokers feel happy. It can damage blood vessels and bronchial intima, make blood vessels contract, lead to tracheitis, hypertension, increased heart rate, coronary artery spasm, and induce angina pectoris and myocardial infarction.
2. Tar: physical and chemical stimulation, which damages human respiratory function. Tar contains many carcinogens and cancer-promoting substances, which is the main cause of lung cancer and love. Tar is also the cause of yellowing of smokers' fingers and teeth.
3. Carbon monoxide: The affinity between carbon monoxide and hemoglobin is 260 times higher than that of oxygen. People inhale more carbon monoxide, which will cause hypoxia in tissues and organs, and then damage many organs such as brain and heart. Carbon monoxide can also increase the storage of cholesterol and accelerate atherosclerosis.
4. Radioactive substances: The smoke contains two radioactive isotopes, 2 10 lead and 20 1 polonium. When smoking, it can be inhaled into the sediments of lung diseases, constantly emitting rays and damaging lung tissue.
Every time you smoke, more than 5000 chemicals will enter the human body. Starting from the mouth, tar will destroy the enamel and will not turn the teeth yellow and black. Then it will enter the trachea and destroy the cilia with purification function. Then the smoke will enter the alveoli, where it will deposit particles and it will be difficult to get out again. Carbon monoxide will enter the blood and replace the original oxygen, resulting in insufficient oxygen supply and shortness of breath. After that, the blood will bring nicotine to the brain, triggering the release of dopamine and other neurotransmitters, including endorphins, which will lead to addiction, increase the viscosity of platelets and induce heart disease or stroke. Harmful substances will eventually enter human cells, destroy DNA, cause tumors, and cause unbearable harm to the body.
Twenty minutes after quitting smoking, heart rate and blood pressure began to return to normal. After quitting smoking 12 hours, the concentration of carbon monoxide in blood dropped to normal level. 48 hours after quitting smoking, the nerve endings of smell and taste began to recover. After quitting smoking 1 month, the cilia in the trachea began to recover, and the lung function showed this good performance. After quitting smoking 1 month, the vascular function recovered and the risk of heart disease was reduced by half. Five years after quitting smoking, the risk of stroke decreased to normal level. After quitting smoking 10 years, the risk of lung cancer decreased by 50%. Quitting smoking 15 years, the risk of coronary heart disease is basically the same as that of not smoking.
Smoking will not only cause health hazards to smokers, but also affect others. People who smoke lightly cause cough, while those who smoke heavily cause chronic obstructive pulmonary disease and lung cancer; Smoking in pregnant women can increase the probability of children suffering from chronic obstructive pulmonary disease to 70%; Children whose parents smoke have a higher risk of acute otitis media.