I would classify myself as a non-smoker but relatively new vaper. I used to enjoy the occasional cigar (maybe a few per month) but had gone without any cigars for several months before picking up a e-cig. I enjoyed (but was in NO WAY addicted to smoking, nicotine or anything of the kind.
First the reasons not to:
1) Vaping APPEARS to be much safer than smoking but in absolute standards, not entirely sure. You're still inhaling or at least getting chemicals in your system. It's almost certainly not GOOD for you but the harm level is likely low but not 0.
2) Vaping could be a gateway to actual smoking depending on your personality.
3) It can be fairly expensive if you really get into it.
4) Forget the whole fitting in BS, it's a royal pain and usually those folks turn out to be the lowest common denominators.
Now, my humble opinion. I only vape 0 nic levels. I actually dislike the throat hit the nicotine gives and have no desire to actually get myself addicted to anything. I also and trying to trend away from inhaling. I take the vapor in my mouth and out through the mouth or nose. I only inhale maybe 1/4 or 1/5 of the time.
Vaping COULD be a gateway to actual smoking and then to joints and then to .... and then to crack. Social drinking could lead you to become a raging alcoholic. I enjoy vaping just like I enjoy the occasional bowl of ice cream, snickers bar or cup of coffee. Just keep in mind that there's a very clear distinction between vaping and cigarettes (and crack pipes) and you should be okay.
All things being equal, vaping is not good for you but is unlikely to be all that unhealthy (though, as others have said, we don't have any long term studies so don't really know). You have no good reason to start so why bother? That being said, I haven't lost any sleep at night due to my newfound enjoyment.