These candles contain special enzymes which actually attack foul odors and removes them from the air. Regular candles just cover up odors and the smoke odor returns once you put the candle out. With the Smoke Odor Exterminator Candles, you are actually removing the odors from the air plus you can enjoy a pleasant fragrance just like a regular candle. They are also great for fighting other odors like kitchen, bathroom and pet odors! Our most popular scents include Patchouli Amber, Sandalwood, Rasta Love, and Hippie Love. Smoke Odor Candles are always introducing new scents to coincide with the changing seasons. Average burn time is 70 hours.