As we all know, smoking is harmful to health. . Different cigarettes release different chemicals when they are lit, but the main chemicals are tar and carbon monoxide. Harmful substances produced by cigarette ignition can be roughly divided into six categories:

(1) Aldehydes, nitrides and alkenes can stimulate respiratory tract.

(2) Nicotine can stimulate sympathetic nerve and cause intimal injury.

(3) Amines, cyanide and heavy metals are all toxic substances.

(4) Radioactive substances such as phenylpropyl pyrene, arsenic, cadmium, methylhydrazine and aminophenol. These substances are carcinogenic.

⑤ Phenolic compounds and formaldehyde, etc. It has the effect of accelerating cancer.

(6) Carbon monoxide will reduce the ability of red blood cells to transport oxygen to the whole body.