I have had an aftertaste s tick around after a bowl of Latakia or if I was freight training a blend giving it an ashy taste but that usually only lasts overnight. Never had it last for days.
Being in Az my smoking is limited to the garage which is cooled and/or going to a local cigar shop. I think it is about 1-2 bowls a week. Winter time here is wonderful and pick it up to about 5-6 bowls a week.
I used to do that when I started but at this point I'll run a pipe cleaner through the pipe keeping it intact. I'll pull the stem off and perform a thorough clean with alcohol about 2x a year.