I am also a clencher and happen to be smoking, clenching, and typing at the present. I obviously wont clench a Nording Sitter or another heavier pipe I have. I actually like smoking while working in the shop, pruning my Japanese plants, or reading and that kind of means clenching. I don't have any nasty teeth marks to report, so maybe I don't have sharp teeth.
One thing I WILL caution you on is I was recently trying to pull a nail out of a small piece of shoe molding while smoking. I near damn bit through the stem when I realized what I was doing. No worries though, all is good. Lesson: don't clench while performing a somewhat stressful task :nana: