I had to switch back to analogs for a day when I misplaced my little kit and lost all my batteries aside from the one I was using and it died. The first cigarette I smoked made feel VERY uncomfortable (though you may have enjoyed it). I didn't get a buzz, I got extreme vertigo. My ENTIRE body was tingling. I don't think it had anything to do with asphyxiation. I don't really know what it was, but I know it was waaaay too much for me to enjoy. I was glad when I found my batts and had smoked up the pack so I could go back to vaping. I'd rather have no buzz than feel that again.
I know that that wasn't in my head.
LOL...no it was likely not in your head. It likely was caused by asphyxiation combined with the other thousands of crap chemicals being re-released into your system.