Dottle

Rapid or hard draws on the pipe can and will produce an excessively hot ember in the bowl causing the moisture content of the tobacco to vaporize and then condense in bottom of the bowl and in the draft hole, preventing the tobacco from burning properly.

Excessive saliva can be a factor but is rarely the cause of a "wet smoke" or pipe gurgle.

[citation needed] Dottles are generally considered troublesome because they lessen the time one may spend doing a bowl.

Dottles can also give a sour taste to the smoke as it is approached by the hot ember.

[citation needed] Some pipes are designed to specifically lessen or prevent the formation of dottle and excessive moisture.