Agave,
I had that too, in fact I used to get it pretty regularly, even when I was smoking. Have no idea what it is, but I agree, it's hella annoying. I even posted a question about it here, when I was about 2 weeks into
vaping.
http://www.e-cigarette-forum.com/fo...thing-tasting-sickly-sweet-vapers-tongue.html
I've always thought it's certain flavorings that do it, whether in foods or in your liquid. Brushing doesn't work, water doesn't work, it's really just a matter of waiting it out.
The last time it happened, I had been
vaping a grape liquid. I don't eat grape-flavored stuff much, or any fruit flavored stuff at all. I used to think it was eating too much sugar--I've never really nailed down what causes it.
I noticed later on after I went on the Atkins diet, that I got that same taste when I was in ketosis. I have no idea if it was coincidence or if that's really what it is.
I hope yours goes away soon--it does pretty much ruin the taste of everything that you put in your mouth.