I finished off a bowl of Dan Tobacco Treasures of Ireland Shannon and let the pipe cool a bit and just dropped some Boswell's Honey Roast in it. Pipe still seems to work! Seriously, I'm not having any trouble sorting out the differences I can sort out (not that I sense a lot of nuances, but enough). I do have a couple pipes that only see one tobacco or type but overall don't worry about it. Guess I haven't smoked enough out of any particular pipe to notice the issues some legitimately do notice.