I know they're bad for small mammals but I don't know about Sugs. Since sugs are more fragile than mammals, I'd imagine it'd be harder on them.
All softwoods have phenols. Ceder and pine are both softwoods so... :S But, phenols are used in disinfectants, exfoliants, treating an ingrown nail, carbolic smoke balls, etc. And, that's the chemical found in soft woods. Not something you'd want to keep your pet in. =X
Here's some good sites about it...
http://www.afrma.org/rminfo2a.htmhttp://members.aol.com/bunrabtoo/cedar.htmlhttp://www.aracnet.com/~seagull/faq/whynotcedar.html
http://www.bio.davidson.edu/Courses/anphys/1999/Cook/Text.htmAnd, according to this site,
http://www.moondance-sugargliders.com/sugar_glider_plant-tree_information.htmpine isn't good for sugs.
Personally, if it was under question, I'd avoid it just to be safe. But, that's up to you to decide.
Now then, I have a question for you because Hollis just pointed something out...why are you wanting scientific evidence done in a lab to support or deny the affect of pine/cedar shavings on animals? Most labs wouldn't waste their time on testing the theory. Yes, cedar and pine shavings could be a variable because it affects the organs, but, one lab has even written in their mandatory procedures that their lab mice can't be kept in the cedar and pine. You have a brain, don't abuse it. Think for yourself and decide based on that. If you don't think it's bad, keep using it. Just don't overlook the possibility of a glider stabbing themself in the eye with a shaving.