The only downside I can see is that some reptile wood is sprayed with a chemical for mites or some such insect that bothers some reptiles. I would ask in the pet dept if it has been treated with any chemicals. If it's prepackaged the the package should say so.
I love the way grapevines look dried(they are used in reptile cages) and they are treated for insects.
So I can't use any from the store, but Georgia Winery is right down the road from us and since they don't use chemicals on their vines I thought about getting some and try to dry it. Just as an experiment. you know? Sorry rambling again

Carol