I see your point though, they are what people consider fun, people might get genuine excitement from smoking........
Like popping a chubby after a toke on a cigar?
I kid, I kid...
But I think you're seeing the point. People smoke for the nicotine, for the rush it gives and the feeling its effects provide. While in the beginning that effect is strong, the body soon becomes resistant and so you have people going through 60 a day, or whatever ridiculous number.
Then, with smoking, the problems start. The health effects begin.
With vaping, that problem doesn't happen. And without the problem, there is... no problem. So then it moves into the realm of other people enforcing their individual opinions on the nicotine user simply because they're don't like the idea of someone being addicted to (or, in many cases, simply enjoying) something that they don't see the point of. But both you and I know what we can both do with our opinions on things of no consequence in the face of someone who disagrees with them: We can shove 'em, and accept doing so because that's how society works. Better yet, we just keep quiet and avoid conflict.
What stands out, however, is that while the reaction to vaping is indeed simply borne of personal opinion or judgement of someone's lifestyle, it seems to hold more weight to those who spew
simply because it looks similar to smoking. It holds all the weight, but none of the content. Yet they're seen as the justified one having a go at a dirty addict who is doing nothing to harm anyone because of little more than a basic visual link. Which is a bit depressing when it comes to analysing those mindsets.
In short, nicotine feels good, and so people continue to use it. Some people don't like being drunk, either. Me? I love being drunk. Hell I'm probably approaching the verge of "functioning alcoholic" but still, I'm not causing an issue with my drinking, so nobody cares. Why not the same for nicotine?