A "Smoke Ring" is a toroidal (doughnut-shaped) formation of smoke that occurs when a puff of smoke is exhaled in a specific way. This phenomenon is created by a combination of airflow and the physical properties of the smoke, which allows it to maintain its shape for a brief period. Smoke rings can be produced by various sources, including cigarettes, cigars, and pipes, as well as by specialized devices like smoke ring generators. The size and longevity of a smoke ring depend on factors such as the force of the exhalation and the viscosity of the smoke. When released, the smoke ring travels through the air, often expanding and dissipating as it moves. This visual effect is popular in various contexts, including smoking culture and entertainment, where it is often showcased in performances or demonstrations.