Smoke is a visible mixture of gases and tiny solid particles that are produced when materials burn. It is often associated with fire and can come from various sources, including wood, tobacco, and fossil fuels. Smoke can vary in color, ranging from white to black, depending on the material being burned and the conditions of combustion. In addition to being a byproduct of burning, smoke can have significant health effects. Inhalation of smoke can irritate the lungs and airways, leading to respiratory issues. It can also contain harmful chemicals, such as carbon monoxide and tar, which can pose risks to both human health and the environment.