heavy nic gives me a strong buzz. That's why I'm a 0mg user now. I get a buzz from 6mg and my wife hates that. It's similar to that feeling you get if you smoke a strong cigar too fast. You start sweating, you get air headed, and then your stomach feels sick. Up the nic then you up the buzz. It's what your body is used to that affects you so much. I vaped 12mg a couple months ago from a sample and I was way too high