i never get car sick either, but the same thing happened to me not too long ago. It had been a long day and I didn't eat lunch. Me and my friend drove out to the shooting range and burned one down on the way. We both emptied out ammo boxes and went to drive home. We smoked another one on the way home and shortly after we finished it, I got to feeling sick. It was a long very very curvy road and I got to feeling really weak. I ended up riding home with my head out the window blowing air in my face to keep from hurling. I wasn't sure if it was from too many cigs, or a mix of having the munchies and second hand smoking gunpowder smoke or what but it really sucked. Hasn't happened since then thank god.