Even though I know and love people who smoke, whenever I see a person smoking in his or her car, I automatically assume that the person is a Really Big Idiot (RBI). Allow me to clarify by saying that I don't assume that smoking is an isolated stupid thing that they do--I assume that the person is of below-average intelligence across the board. I can't help it, it's just my natural instinct to think they're dumb. And, truth be told, I try hard not to drive next to people who are smoking in their cars because I think that RBIs are far more likely to cause accidents. So let this be a public service announcement: The smoking? It makes you look like a moron.
(Because hindsight is 20/20.)