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Originally Posted by orangebird
It's bad enough when you're pushing your baby in a stroller down the high street. Nothing to grin about really Chris.
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It's not nearly as bad as you think. Thanks to catalytic converters, car exhaust is basically nitrogen and carbon dioxide. Quite useful for the suicidal but not directly harmful to the passing pedestrian (except for CO2 being a greenhouse gas of course).
Trying to make a direct comparison between tobacco smoke and car exhaust is yet another red herring.