Thanks everyone for the info! I've kept my pet rats on recyled paper for the last few years, and my breeders on pine bedding for the last few months. I haven't had any problems yet and I'm glad to hear people won't bash me when they find out I use pine bedding.

LarryPetty, I have been looking into horse pine bedding because we have horses and I'm glad to know I can use that for the rats! Thanks!