I was wondering if burning candles, having a read wood fire in the fireplace (smoke) or diffusing essential oils in the house are hazardous to sugar gliders? Obviously I wouldn't place a cage near a fire, but the way our house is designed, the smells eventually spread throughout the entire house.

As long as the smells are not too strong and you get candles with cotton wicks, zinc in the wick is harmful even to us, I think you will be fine.

I just got a essential oil diffuser to use in the apartment.

Thank you! I have some woodwick candles, so shouldn't be any zinc in them, plus they crackle when they burn :-)