Ok. My reply does not have to do with reptiles, but I have been wondering about this for some time. I have kept rabbits in the past. I would always keep them on aspen because pine was not safe. Well, then I was doing some Googling one day and was reading about Kiln Dried Pine. Said it was different than "regular" pine. Said it was safe to use with rabbits who have sensitive respiratory systems. I bought some to use with my rabbit and I loved it! Absorbant and much nicer than aspen. And no breathing problems for my bun. Ok so that doesn't really help, but after reading all this stuff about why not to use pine with snakes I've been wondering if the same arguement (pine vs kiln dried pine) is true for reptiles.