I think there's a difference between taking in too much nicotine over a long period of time and just getting a buzz off something.
I was out drinking a few weeks ago in a vape friendly pub and I went through like 5mls in no time flat cause I was a little drunk and not thinking about. At one point I noticed that I felt terrible and realized it was time to put the PV away, and the feeling stuck with me for like an hour even though I didn't have a single drag.
On the other hand you have the head rush or the buzz, whatever you want to call it. If I have three big lung inhales off my IGO-L I get a mad head rush from the nic. It's sitting at .6 ohms with a large airhole and the nic delivery is crazy. I don't think that taking a few drags off that is 'dangerous' or ' irresponsible ' at all. If you do that all day, yeah you're gonna feel awful and it's not good for you, but now and then I personally don't see the big deal.