You cannot regulate the free market or human behavior. Many have tried. All have failed miserably.
The whole push behind banning cigarettes was supposed to be second hand smoke affecting non-smokers and those around the smokers. Vaping does not do this, especially if there is no nicotine. Could it be an annoyance to others? Yes it could but banning it on the possibility of health reasons without evidence is stupid and infringes on freedom. It also presupposes that the government has the right to tell individuals what they can and can’t do. It’s one thing to regulate civility in public areas and another to just say it looks like smoking so ban it.