I'm still really new here at this forum, but I think Kristin is right. If you do some basic research about nicotine, it's pretty harmless except for its addictive nature (which is huge, of course). It's the carbon monixide that gives smokers the "light-headed" or "head rush" feeling, and you don't get CO from vaping.
I've only been vaping for 10 days (definitely loving the not smoking), and I feel very satisfied with the "throat hit", but I do not get any kind of "head buzz" like I did with smoking. I remember clearly that "buzz" you are talking about -- it happened for me if I smoked after not smoking for several hours. Honestly, I only missed that feeling the first couple of days that I started vaping. Now I really don't miss it at all.
BTW, I was a 2-pack-a-day smoker for 38 years.