Smoking is addictive, called tobacco dependence. Tobacco dependence is a chronic disease. The international classification code of diseases (ICD- 10) is F 17.2, which has its corresponding clinical diagnostic criteria.
Nicotine is the main substance that causes tobacco dependence in tobacco, and its pharmacological and behavioral processes are similar to other addictive substances, such as heroin and cocaine. Once tobacco addicts stop smoking, they may have a series of withdrawal symptoms such as craving, anxiety, depression and headache. At the same time, tobacco dependence has a high recurrence rate, and its treatment often requires the assistance of professionals and scientific methods.
A lot of research evidence shows that quitting smoking can reduce or eliminate the health hazards caused by smoking. People of any age can benefit from quitting smoking. The earlier and longer it lasts, the greater the health benefits. At present, there are effective treatment methods to significantly improve the long-term smoking cessation rate, including short-term advice, drug treatment, smoking cessation consultation, smoking cessation hotline and so on.
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.
Second-hand smoking (SHS) refers to the smoke discharged from the burning end of cigarettes or other tobacco products, which is usually mixed with the smoke discharged 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.