Scentsy uses a food-grade petroleum-based wax. Petroleum-based wax is use because of its superior scent-loading ability, melting point and firmness. Scentsy designers could not find a good-quality vegetable-based wax that held the scents. The reason Scentsy candle bars are safer than traditional candles is that Scentsy warmers only warm the scent out of the wax. The wax remains in the warmer, so there is no danger of chemicals being released into your home. You will end up with a piece of non-scented wax that you then dispose of and replace with a new Scentsy candle bar. No wick, no match, no flame, no soot, no smoke, and no wax evaporation!