Nitrous oxide, by its scientific name, is a colorless gas with a slightly sweet taste that was discovered by an English chemist in 1799. Mainly used as an anesthetic, it has a very good analgesic effect, but the anesthetic effect is weak, often used in dentistry, can relieve pain while allowing patients to respond to the requirements of the doctor.

Later, "laughing gas" was used by some people to snort, compressed nitrous oxide into small cylinders, which were then fed into balloons for snorting. The main users of nitrous oxide are teenagers aged 18-35. Teenagers have poor discrimination and some people do not know they are taking drugs. When inhaled, nitrous oxide makes people feel euphoric and make people laugh, so many people become addicted to it.

At present, it is not considered as a drug in China, but long-term use of "laughing gas" can cause heart disease, damage to the central nervous system, mental confusion, slow reaction, mental disorders, paralysis and even death.

Although "laughing gas" is very dangerous, it is not in the category of drugs regulated by the Chinese state, nor is it included in the Catalogue of Narcotic drugs and Psychotropic Substances. Because "laughing gas" plays an important role in many fields, such as medical treatment and chemical industry, it is difficult to control. If it is included in the scope of drugs, it can only be used in medical treatment, teaching and scientific research, which will seriously affect the social economy.