Laughing gas, scientific name nitrous oxide, is a colorless and sweet gas. It has anesthetic effect, often used as a food additive, such as for foaming cream, so it is also called "cream air bomb" Laughing gas is addictive, and smoking can make the facial muscles lose control, forming a weird dementia smile.
A large amount of laughing gas can produce a series of side effects such as hallucinogenicity and audiovisual dysfunction, which can seriously cause paralysis.