I have what some may call a recent urban legend. It may be slightly off topic but it's a good ponder.
I have heard or read recently that new car emissions are getting so low that the amount of noxious harmful things coming out of your tailpipe are almost 0% The article or story went on to say the emissions are basically mainly water vapor. And no, I do not think they were speaking of hydrogen fueled vehicles. Which I have read truly emit only water out of their tailpipe. But any way, it went on to say that you could basically suck on tailpipe fumes without said emissions being toxic enough to do you in. My question is who out there is stupid enough to test this out?