I'll take a shot at this, as a non-smoker it's just a guess.
It's because if someone has trash in their car, they can set it aside, and toss it in the next receptacle they get to. The reason peole don't use their ashtrays, is because they don't want to reek up their car with the smell, thus the flicing out the window...
... this is just a guess.
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"And I don't wish that girl any bad luck," he said, "but I hope she gets hit with a car."
- Tommy Lasorda
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