I have a problem where I smoke....constantly. Not many pipes in my collection and have never really...rested them much. Over the years, have had absolutely no issues, all of a sudden the other day I picked up each of my pipes and there are four that soured, each with a different tobacco smoked out of them. I keep them cleaned out regularly, so didn't see this coming. My main pipe is probably the worst, I know some may frown on it but I smoke Admirals Choice Vanilla Cavendish out of it several bowls a day. This was picked up from my 84 year old neighbor who smoked it bowl after bowl. I could understand the abuse I give that pipe ending up sour....but four at once? Even the meerschaum had a funk about it. Getting ready to do a bit more cleaning on all of them but a little frustrated with this and assuming I'll have to salt treat it if a good reaming and a long rest wont do. Is there any advice on preventing this in the future? Can anyone explain a cause? Now that I've started smoking again, it's thrown a stick in my spokes.