Hm.. I've found that my pipe smoking is much different than say cigarette smoking. I don't smoke because I feel that I need to, but rather because I see my pipes and say, "Hm, a nice smoke sounds pretty good about now." So I will go days or even a week or so in between smokes. So that's not out of the normal.
Now do you experience the weird taste after you've smoked? or is it unrelated to smoking? If it is unrelated then it may be a medical problem. Your mouth is a window into your stomach. If you have proper oral hygiene habits and you experience un-provoked odd tastes or smells you may be sick and should probably make an appointment with your doctor.
Now if you feel the taste is related to smoking, test it out, and don't smoke for a week and see if the taste persists. If not then it most likely is cause by the tobacco or the pipe or both.
Sorry if I wrote a novel on what could be solved with a pamphlet, but I wasn't quite sure what you meant. Good luck friend.