I never used to like the look of bamboo on a pipe. Now, with all this bamboo pipe porn floating around, it's starting to grow on me. One question: when a pipe is made with a bamboo stem, is there some sort of tube (like an InnerTube) lining it, or is it just drilled? I always thought bamboo was hollow and had a pretty big hole through the middle of it. I would think that would give a hugely open draw. ???