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It has been my experience the skin is best left on for smoking as it will help retain moisture within the meat. The skin tends to bunch up a little if you rub too hard but a light coating of oil will help the rub stick and reduce the friction between your hands and the skin. What I do personally for flavoring birds is dissolve a dry rub I like into a brine and use that to flavor the chicken because I think the flavors get into the meat better than rubs/injections alone.