And whenever you tell them "please stop vaping here", unless you're a bouncer, they'll lash out saying "it's not illegal, show me which law forbids me vaping indoor; yeah smoking is forbidden indoor, but vaping is not smoking and this is just steam bro, not smoke, it's not dangerous for you".
Some venues enforce a vape ban on their own, but most don't want to piss off their customers, so many venues ignore the people who vape inside.
Vapes cause at most 1/100 the harm cigarettes do. There is no combustion products, only nicotine, and not always. The only harm they do is as a possible gateway to actual smoked tobacco. As such, banning them while allowing tobacco is completely nonsensical. It should be the other way around.
They are more attractive to kids.
Tobacco is an acquired taste. I enjoy a yearly cigar but even it can be a bit strong for me.
Vaping has flavors and is smooth and gentle.
The problem here is not just that cigs are worse for you than vaping. Kids smoke because smoking is rebellious behavior. Making vaping illegal will only make it more rebellious. Also nicotine is a pretty solid fix for anxiety which kids are full of.
There is a an alternative argument that vaping bans are due to tobacco industry insiders. Honestly though they would probably refer to capture profits than ban them.
Vaping is relatively safe, esp compared to tobacco. My two pack a day mother who smoked since she was 14 moved entirely to vaping and got her nicotine habit very under control. This was a woman who got in trouble for smoking in a hospital bed pregnant yet was willing to forego her vape for four hours without even a complaint last time she had to fly.
I guess if flavor bans don't count for you, this wouldn't bother you. For me, this is a major "throwing the baby out with the bathwater" move that will remove access to a class of product with great effectiveness for smoking cessation and harm reduction. The reasoning, to my eye, seem to be largely moral panic bullshit, largely caused by the popularity of vaping among teenagers. (Why not impose harsher penalties for stores selling to underage kids? Seems to work fairly well for liquor in my experience.)
I'm also generally opposed to prohibition and think adults should be able to decide what goes into their bodies, so I'm opposed in principle.