Nitrous oxide, commonly known as laughing gas or happy gas, is a colorless, non-flammable gas, with a sweetish odor. It's used in medical and dental procedures as a sedative, relieving anxiety and ...

Many teens have shared videos on social media showing their use of nitrous oxide, or laughing gas, which is sold in small metal canisters. smartboy10 via Getty Images Inhaling nitrous oxide is a ...