I haven't used pine for my snakes, mainly because I love my newspaper.

However, I've only just started breeding rodents mid last year but I have exclusively used kiln dried pine for their bedding and I love it! My newly set up mice are healthy as can be and so are my rats who are doing just fine. No sniffling, sneezing, etc.

I have to agree that aspen sucks- used it for 3-4 years with my first bp, it barely absorbs anything