And I saw one on a YouTube vid of a walnut pipe.... I'd be concerned about some of those woods. Maple would be ok, no tannins in maple, but walnut, I don't know.
I have heard it said, many times, that the only woods that work well, for making pipes, is Briar (Various Types and Grades), Maple and Cherry. Pipes have been made from many different types of wood but they usually burn out quickly.