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Generally I would say that burning(flame/smoldering) anything is bad for you. Even simplest hydrocarbons (methane, propane, butane) with imperfect combustion have negative effects. You can make it slightly better, but smoke is most likely always carcinogenic.
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Cars, trucks, powerplants, indoor air, are bad for you.
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Indeed they are, and you should also minimize exposure to the fumes from cars/trucks/powerplants and try to improve indoor ventilation.
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I don't generally suck on the tailpipe of my car like a cigarette or vape.
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