Why do you think it's poison? The only reason I would be uneasy about using it is if it isn't kiln dried. Even so, like I said, there are no studies to be found on the effects of even raw pine on reptiles so I don't know. A small amount of pine, which must be dried and treated in some form I imagine to be added to the Aspen, couldn't be completely useless. If you're that uneasy about it, do you breed rodents you could use it for?