My wife and I were zipping down the interstate one day when we saw this long cloud of thick, blue smoke ahead of us. As we got closer, we saw that it was belching out of the smoke stack of a semi. The smoke was so heavy you could hardly see as you passed it. It was a good time to hold your breath. These two guys were driving along laughing, seemingly oblivious to the smoke, and the smell that they were spreading down the interstate. Then I noticed some black spots on our windshield, and of course I did what would be instinctive to do, I started to reach for my windshield wipers, and man I'm glad I didn't. I looked at the car in front of me and saw he had turned his on, and all he had done was streak oil all over the window of his car; he could bearly see. That driver probably thought the smoke was just his problem. Hey, it was a problem for everyone who got close to him!