Smithen said:what type of enclosure do you have him in? if it is a glass tank then the air flow through it isn't that good so what it might be is the moisture in the substrate evaporating from the heatlamp, that would explain the mist. For the smell it might just be the moist substrate that you are smelling.
Tyler
Sounds about right. I have mine in a tank, and I can see condensation in the corners sometimes. There is a smell when the substrate is damp, although, not an unpleasent one.