Why do candles burn without smoke but produce smoke when blown out? This video covers the basics and includes two experiments involving candle smoke. One of the experiments is a well-liked, magic-trick-like demonstration, where you get to light a candle from a distance. THESE EXPERIMENTS REQUIRE ADULT SUPERVISION! Dealing with candles, lighters, matches is very dangerous. Fires can cause serious injuries, massive property damage, and can even be fatal.