after one bowl of some blends I notice it. Cause palate fatigue not just with pipes but anything with a strong flavor starts pretty much right away. It's just really subtle at first, some of the nuances don't jump out, ironically a small amount of palate fatigue helps notices the other nuances of blend. That part of it is just how your brain works and most peoples brains work. The brain likes being efficient and part of that efficiency is not paying so much attention to the way that thing tastes after you've already tasted it. But yeah if I smoke more then a few bowls the palate fatigue becomes infinitely more noticeable.