I had about three hours of driving ahead of me today, so I thought it would be a good opportunity to smoke a few bowls while I was in the car. I ended up smoking about 4 bowls...a couple of virginias and a couple of english blends. I got home and was getting ready to head to the gym and didn't want pipe breath, so I went to give my teeth a good brushing and to my horror, the back of my tongue was BLACK...not brown, but BLACK! around the black area was a typical brownish sort of butterscotch color. I brushed my tongue, but it took several tries, rinses and a lot of fighting a gag reflex, but it pretty much went away. Having smoked cigars for 20+ years (pipes about 3+ now) I have never encountered a black tongue before. The odd part is that I was impressed that none of the 4 different blends seemed to "bite" at all. So I am wondering how often more experienced smokers run into this. Could it be caused by latakia in the english blends?(smoking something that has been treated with smoke) Could it be caused by the pipes being in need of a cleaning? I should be noted that the area was right where the draw holes of the pipes deposit the smoke on the tongue So, what is your experience, opinions?