Plenty of people use aspen shavings with no problems. Just watch out if there's a lot of dust in the shavings, that might pose a problem.

I personally don't use them any more because one of my snakes got a splinter stuck near his nose, and now use kraft paper and newspaper for my big cages, and Carefresh (for my smaller cages), but it is a very common substrate.
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Lauren Madar - OphidiaGems.com | CageMakers
1.1 Ball Python, 1.0 Hog Island Boa, 1.1 Hypo BCI, 1.1 Surinam BCC, 1.1 Saharan Sand Boa

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