1. Influence on cardiovascular and cerebrovascular diseases: Smoking is an important inducement of cardiovascular and cerebrovascular diseases such as hypertension and coronary heart disease. Statistics show that 75% of patients with coronary heart disease and hypertension have a history of smoking. Nicotine and carbon monoxide in smoke are considered as harmful substances. Smoking can damage vascular endothelial cells, increase cholesterol, cause peripheral blood vessels and coronary arteries to contract, and cause myocardial hypoxia. Therefore, smokers with cardiovascular diseases are more prone to arrhythmia and the risk of sudden death is increased. ?
2. Impact on respiratory tract: Smoking is one of the main causes of chronic bronchitis, emphysema and chronic airway obstruction. The probability of smokers suffering from chronic bronchitis is 2-4 times higher than that of non-smokers. Patients often have chronic cough, expectoration and dyspnea during activities. Even young asymptomatic smokers have slight lung dysfunction. ?
3. Carcinogenesis: The most direct cancer related to smoking is lung cancer. Studies have shown that if you smoke more than 35 cigarettes a day, the probability of developing lung cancer is 45 times higher than that of non-smokers. Smoking will reduce the activity of natural killer cells, thus weakening the body's function of monitoring, killing and clearing tumor cells, which further explains why smoking is a high risk factor for many cancers.
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Zhong Nanshan calls for a ban on smoking;
More than 8 million people worldwide die from tobacco every year. Among them, more than 7 million people died from direct use of tobacco, and about 6.5438+0.2 million non-smokers died from exposure to second-hand smoke. China's tobacco sales rank first in the world, and about 5,000 people die every day in China due to tobacco and second-hand smoke exposure.
"At present, we all know and guard against the serious threat posed by COVID-19, but don't forget that smoking and second-hand smoke are also the main risk factors of respiratory diseases," said Dr. Zhong Nanshan, an expert on respiratory diseases. "We should control tobacco more resolutely."
People's Network-What harm will smoking bring?