I think it's just your body getting rid of the chemicals from the cigarettes. When I first started vaping, I had this terrible metallic taste in my mouth for a week. I was really worried it was something in the juice or atomizer. Turns out my gums were bleeding, which is pretty common after you quit smoking. Just think, you were regularly ingesting 4,000 chemicals everytime you sucked down a cigarette. That stuff adds up and your body has to get rid of it somehow. Have you ever eaten really strong curry? You smell like a market in Bangledesh for a couple of days after eating it. Give it a little while and if it doesn't go away or it gets worse, go see your doctor. I'm not a medical expert by any stretch, but I think you're alright.
Thank you Doomed!