Nitrous oxide, commonly known as laughing gas, is a colorless, non-flammable gas with a slightly sweet odor. It is used as an anesthetic and pain reliever in dentistry and other medical procedures. It is also used as a recreational drug, often inhaled from whipped cream dispensers or balloons.
Smoking is the act of inhaling and exhaling the smoke produced by burning tobacco. It is a major risk factor for a variety of health problems, including lung cancer, heart disease, and stroke.
