Hi Dawnads, I am very sensitive to metallic tastes, but haven't shared your experience, though I did have an issue with a Pomegranate carto early in my Vapor4Life days. It was a freebie, down to my last carto with any nic in it, and I was hanging out for my next order. It was so vile (to my tastebuds) that it tasted like metal and made everything taste like metal.
This is a long shot, but have you looked at your tongue? If it has a green coating, it could be an oral thrush - imbalance in your digestive system. This can cause certain flavours to taste metallic.