Smoke grenades are devices that produce a dense cloud of smoke when ignited. They are commonly used in military operations, training exercises, and by law enforcement for crowd control. The smoke can provide cover for movement or signal a specific location. These grenades come in various colors, allowing for different signaling purposes. The smoke is typically created by burning a mixture of chemicals, which can also be used for marking areas in military exercises or paintball games. Safety precautions are essential when using smoke grenades, as the smoke can be harmful if inhaled in large quantities.