I know there is a lot of emphasis put on the type of pipe that you smoke a particular tobacco in, but it is not something I have ever concerned myself with. Mostly. The only real exception is Erinmore. I won't smoke anything else in a pipe that has had Erinmore in it. I like the stuff, but I don't want everything else to taste like pineapple. I've smoked a pipe around twenty years, and for me there has never been a problem smoking different blends in the same pipe. Except Erinmore. Even if there is a ghost, I find that it goes away after a couple of bowls. Unless it's Erinmore. You may even find that the flavor of two or more blends smoked in the same pipe meld together to form something you would like to smoke. All that said, if it is an issue then you can always stock up on cobs for sampling.