Ha, I smoke in the shower every day. I've never had a problem. I also drink sodas, esepcilly Mountain Dew while smoking occasionally. What is wrong with that? It compliments a tangy acidic Virginia or VaPer very well, IMO.
I also only smoke straight pipes in the car. Bent pipes make the smoke waft in my face more.
I would think that the only things I would avoid would be drenching yourself in gasoline or jumping on a trampoline while smoking. I would have included skydiving, but as I have a friend who says he smokes a cigar on all of his dives that I can only think that a pipe wouldn't be too terrible an idea. I have no plans to jump out of a perfectly good plane anytime soon though.