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Publicity content of no tobacco day in kindergarten
The smoke produced by tobacco combustion is a complex mixture of more than 7,000 compounds, of which gas accounts for 95%, such as carbon monoxide, cyanogen hydride and volatile nitrosamines, and particulate matter accounts for 5%, including semi-volatile and non-volatile substances, such as tobacco tar and nicotine. Most of these compounds are harmful to human body, of which at least 69 are known carcinogens, such as polycyclic aromatic hydrocarbons and nitrosamines, and nicotine is an addictive substance.
Secondhand smoke refers to the smoke emitted from the burning end of cigarettes or other tobacco products, which is usually mixed with the smoke emitted by smokers. Secondhand smoke contains hundreds of known toxic or carcinogenic substances, including formaldehyde, benzene, vinyl chloride, arsenic, ammonia and hydrocyanic acid.
Secondhand smoke has been identified as a class A carcinogen by the US Environmental Protection Agency and the International Agency for Research on Cancer. Compared with the smoke inhaled by smokers themselves, the concentration of many carcinogenic and toxic chemicals in second-hand smoke is higher.
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