we have wall plug ins all over the house, a scentsy tray in the family room, and lit candles all the time all over the house. I dont think airborne stuff like the particles that make up the scent of the candle will do anything to our lizards, but too much smoke or larger particles like that will defiantly hurt any any animal. I also have a fan blowing about my chameleon, so its not like there is a candle 3 feet away poring in thick scent. that might get confusing for the lizard. Just my 2 cents.