Luke Skywalker uses Tibanna gas on Darth Vader.
Gases are matter in a state where they expand to completely fill any available volume. Examples include oxygen, which is commonly invisible, and Clouzon-36, which appears as a visible, misty substance. Planets with surfaces, like terrestrial planets, often have an atmosphere, which consists of a relatively thin layer of gases surrounding the planet. Conversely, gas giants are planets primarily composed of gas. Facilities like Cloud City on Bespin are gas mines designed to extract and refine gases from a planet's atmospheric composition. Breathing is often reliant on certain gasses for living organisms, while some gases are poisonous to some species. Furthermore, some gases can be employed as drugs, such as those that induce unconsciousness. Most beings are also capable of producing gases through flatulence (or "farting"), which results from gas accumulation in the digestive system that requires release. Consuming extremely powerful spices, like anilam, can cause abnormally high levels of flatulence, as happened at Snap and Karé's wedding, causing uncontrollable gas release among those who ate it.