Currently it's still somewhat accepted to vape inside of public buildings. Which, IMHO, is insane
Why though?
I'm not arguing for or against vaping, just stating that the negative health effects from vaping appear to be rather minor. In it's pure form its just nicotine and propylene glycol. Nicotine is well studied and similar to caffeine in harm (outside the addiction) and PG is used in medical inhalers (along with almost everything else, seriously its used in food and cosmetics everywhere).
Well because second hand smoke is so obvious and real and second hand vape... I mean... I'm not convinced it even exists. I see the vapor for about 2 seconds then it's gone. I can sniff as hard as I want, I'm not smelling anything.
But smoking? Woof. I could tell someone smoked 2 hours ago from 10 feet away. My fingers used to smell like ash 24/7. Even walking past someone 20 feet away, outside, in the wind, you can clearly smell cigarette smoke.
So I don't think it is the same.