How much pipe moisture is saliva drooled in the process of clenching or condensed from the mouth as you puff? I doubt there is any authoritative study on this, so the floor is open for hypothesis and speculation. Usually when we speak of moisture, we think of ambient humidity or moisture from the tobacco and/or the burning process. We don't often think of ourselves as a source. Of course, we're talking about other pipe smokers; I don't have any moisture problems and always smoke dry as a bone. Ahem.