After a candle is blown out, you can relight it using its smoke. In this video, η tiktokers kkubi99 from Korea is trying this experiment. He blows out a candle using a glass and lights a lighter to the smoke above the candle. After a few seconds, the flame seems to descend into the wick as if by magic. This is happening, is that the molten wax evaporates and decomposes into a flammable gas. It is this gas contained in the smoke that catches fire and allows the flame to travel to the wick.