Dottle is the wet and sour-smelling mass of unburned tobacco found at the bottom of a tobacco pipe. Dottle is produced by a combination of two reasons, first the smoker is a "wet smoker", that is, he pushes a considerable amount of saliva down the stem and into the bowl, and second the tobacco being smoked is excessively moist. Puffing too fast can also be a factor depending on the humidity of the tobacco. The foul liquid that collects at the bottom of a pipe results in gurgling and can be accidentally sucked up. Pushing a pipe cleaner down the stem can remedy this problem to a point.
Dottles are generally considered troublesome because they lessen the time one may spend smoking a bowl. Dottles can also give a sour taste to the smoke as it is approached by the hot ember. If dottle is not promptly removed after smoking, the pipe may eventually give a foul taste to any tobacco smoked in it. When this happens, pipe sweetening is required.
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