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I would think so. As I understand it, Oak galls are usually caused by a reaction to insects. One concern I can think of is do you know if any pesticides were used on the tree that might have been absorbed by the wood? I that is a possibility, I would not use the wood. Also where are the galls? Most are in the leaves and limbs and I would think you are talking about splitting the main body wood into "splits" for smoking.