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I'm not familiar with the automotive exhaust dangers. I have no opinion, and won't until I know enough to justify opening my mouth on the subject. You understand, I'm sure.
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I think you can make a mildly educated guess based on people committing suicide by leaving the car on in a closed garage or the constant weeping about greenhouse gases. I daresay that car exhaust will have a greater impact on your hypothetical children's lives than the smoking habits of your future parents-in-law.
Or are your parenting skills so pathetic that you can't bother to explain why smoking is bad, despite their grandparents doing it?
Jam it back in, in the dark.