Sounds like you're using the wrong fuel. If we'd switched all the petrol cars over to propane instead of having "scrappage schemes" to sell people new "cleaner greener diesels" - and you see how that worked out - then we'd have pristine fresh air in our cities now.
Second hand smoke is a large (almost overwhelming) factor in SIDS. Also for people who don't smoke, it smells f--king disgusting. Nobody wants to deal with that in their life.
Those of us who don't smoke or vape can smell that shit a couple of hundred metres away.