Not sure whether this is a basic question, or an Intermediate, or an Advanced... and apologies if a similar thread already exists (I've had a cursory look, but there are so many). Anyhow... given that one can only own so many pipes, and that rotating them is generally considered desirable, I wonder what the hive mind thinks about dedicating different pipes to specific Virginia/Perique blends? I ask, because no blend seems to smoke the same in different pipes, no matter how thoroughly any ghost has been exorcized from them. How much of this, do we think, is actual physics, and how much psychology?