I work in a saw mill and 99% of are wood is hardwoods with the 1% being pine. For people who don't know a kiln is a big heater that is used to dry wood. When kiln drying pine it just dries the water and oil but once you add moisture (humidity in enclosure) again you get the majority of the oil back. A kiln does not get hot enough to evaporate all the pine oil but you loose a little. But I won't sit here and say that its not safe for reptiles. I believe some species may be more prone to pine then others. I also think that an individual of one species could have a reaction and others of the same species might not. I did read one study on pine and reptiles and very few herps showed symptoms and others of the same species showed none and they concluded from that it can take years for any symptoms to be visible and you may never even see any in the lifetime of the herp and it seemed the most were unaffected. Someone on another herp forum I belong to did the study themselves and posted the results years ago and for the life of me I can't find it or remember who did it. It was more in depth then what I wrote including the reptiles they tested. I didn't want to post till I did find it but unfortunately I can't. Basically if your in doubt then don't do it, this is why I don't use pine. But I can't argue with years and years of people using it with bp with no I'll affect.