"담배 불씨" refers to the glowing ember at the end of a 담배 (cigarette) when it is lit. This ember is created by the combustion of tobacco and other materials in the cigarette, producing heat and light. The temperature of the ember can reach up to 900 degrees Celsius, which is hot enough to ignite surrounding materials. The presence of a 담배 불씨 poses fire risks, especially if it comes into contact with flammable substances. Proper disposal of 담배 butts and ensuring that the ember is fully extinguished can help prevent accidental fires. Awareness of these risks is important for safety in both public and private spaces.