I smoke while driving in my car and at work in my truck, I'll drive a good 4 to 6 hours without stopping on a good day. And most of the time that's the only place for me to actually enjoy my pipes during my day. So I had to come up with a one handed pipe packing system. Put the tin on lap, open tin, put lid between legs, take pipe and slide tobacco into bowl with one finger, clench pipe, close tin, toss tin into overhead cubby, light pipe. all with one hand and keeping eyes on the road, but in my further defense I usually try to pack a pipe or two before I start driving. As to smoking in a vehicle in general, it will stink it up quite a bit without proper ventilation, and when you do drop your pipe (especially driving 65-70 with a load pushing 80k) it can be a bit of a distraction but at that moment you just have to ignore it until you've assessed the situation. Also been thinking about vehicle friendly pipe racks.