Smoking is harmful to health. Research shows that tobacco-related deaths now account for the first cause of death in the world. The chemical components in tobacco and smoking products are extremely complex, including tar, nicotine, phenols, alcohols and other toxic substances, some of which also have carcinogenic effects. The longer you smoke, the higher your chance of getting sick.

1, easy to cause respiratory diseases: the smoke produced during smoking mainly enters the human body through the respiratory tract, and the respiratory tract becomes the most damaged part of harmful substances in tobacco. Harmful substances will directly act on respiratory mucosa such as trachea and bronchus, causing diseases such as bronchitis, pharyngolaryngitis and emphysema;

2. It is easy to cause cardiovascular diseases: nicotine in tobacco will promote vasoconstriction, cause coronary artery contraction that supplies heart blood, thus affecting the blood supply of myocardial tissue, and will induce cardiovascular diseases such as coronary heart disease and hypertension;

3, easy to cause cancer: tobacco tar is one of the most important carcinogens in cigarette smoke. The carcinogens in tobacco tar are mainly polycyclic aromatic hydrocarbons, nitrosamines and some phenolic carcinogens. Studies have shown that tobacco contains at least 43 known carcinogens, and about 30% of cancer deaths are caused by tobacco. Smoking can easily induce lung cancer, oral cancer, laryngeal cancer, leukemia and cervical cancer.

4, other hazards: smoking will also affect vision, leading to menstrual disorders, rough skin, digestive dysfunction and so on. Smoking during pregnancy may also lead to fetal malformation and miscarriage.

In a word, smoking is harmful and useless, so it is recommended not to smoke as much as possible.