OK, so let's see - pipe #1 (the front) ghosts its flavour to pipe # 2, which then adds its bit, traveling through the stem, so confusing the taste buds that the smoker immediately decides that pipe smoking isn't for him (her).
Or, scenario # 2, you fill the front (if you live here in Washington State) with a well-known non-tobacco product, the back bowl with an Irish blend, and get a weed-and-nic hit that sends you reeling.
If you're gonna market it, I suggest "The Blender's Briar" as a brand name.