The disadvantages of smoking

1, the effect on cardiovascular and cerebrovascular diseases.

Smoking is an important cause 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. Effects on respiratory tract

Smoking is one of the main causes of chronic bronchitis, emphysema and chronic airway obstruction. The incidence of chronic bronchitis in smokers is 2-4 times higher than that in non-smokers. Patients often have chronic cough, expectoration and dyspnea during activities. Even young asymptomatic smokers have slight lung dysfunction.

3. Carcinogenesis

The cancer most directly 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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