The heel of every pipe I smoke is swampy looking, even smoking very slowly and starting with very dry tobacco. I'm starting to think 'smoking to ash' is just a myth

I have a hard time believing I'm smoking too fast. Yesterday I got over 2 hours out of 2 coins of bullseye flake and there was still some left in the bottom of the pipe when I got back to the shop and had to abandon it to get some work done. I shook it out and it was starting to get pretty wet tho.