I agree that it's kind of like a hobby. I think this is largely because many of us didn't actually enjoy smoking per se. Not that smoking can't be pleasant, but it also has the negative feeling of an addiction (which it is) because you know it's unhealthy and it's SO hard to quit even knowing that. Plus I know a lot of us got to the point where we didn't actually like smoking all that much. I didn't even really like the smell of it, nor do I like cigarette smoke in my face, even as a smoker.
With vaping there are no known negatives, and even without a ton of research I think we can reasonably assume that it's WAY safer than actually smoking (propylene glycol is known to be a safe food additive and we're not exactly absorbing large amounts of it into our bodies daily by vaping.)
So it's nice to be able to enjoy something that we know isn't killing us, and with so many different flavors to try, mods, etc., and different devices!