Stupid? Honestly, that's a bit harsh. Also, there is a clear, day-and-night difference between breathing or driving and smoking. We were designed to breathe, and it is to our benefit and that of the Kingdom if we stay alive by continuing to breathe, if we are doing God's work. Driving is also a tool that can be used for God's glory, not with intrinsic benefits, but effecting them. Pollution has never been shown to kill people like smoking does, and the benefits of using a car far outweigh the disadvantages/risks. My main point is, how is there such a difference between drugs/drinking and tobacco? You are not totally incapacitated, but the purpose is the same, namely to bring pleasure only to yourself, which is completely unprofitable, in fact negatively so, since at the same time you are wasting God's resources that He gives us, like money, time, physical health, etc.