I do believe kiln dried pine pellets are fine because they don't contain the phenols that natural pine does. The phenols in pine are what cause respiratory and skin problems in most animals, especially BPs. Kiln dried pine is believed to be safer but, yes, it does in fact suck the moisture out of the air. Counterproductive when trying to keep a Ball Python.

If you can get a hold of Aspen bedding, that is your best bet, above all else.