this is interesting, I didn't know anyone vaped unflavored, until I did so myeslf today. I had a really bad morning, my bottom feed quit working, the only ego battery I have left wasn't charged, I gave my 510 to my kid..and I need to vape BAD, I put as much of a charge on the ego as I could, put on an atty and drip tip and the juice (one of my favorites) almost made me throw up, it had a harsh, acrid, slightly metallic taste. I go to my juice box and OMG I can smell that in EVERY bottle of juice that I have. At this point, I'm getting freaked out and I'm thinking maybe I have become sensitized to the taste of nicotine, so I mix up an unflavored batch to find out..well that's what I'm vaping now and it's ok; I don't notice that metallic taste.... I'm so confused..but I know for sure I will have to vape this until I get over whatever happened to me this AM.