Yeah it really is common to get a little in your mouth now and then; if it's just a little spitback, I take a drink of my current beverage and it's gone; at 4mg, I don't think a few drops will hurt me. When I've actually sucked a fair amount into my mouth, I usually run and spit it out and rinse out my mouth, because that shit BURNS! From the nicotine, but also, I put a pretty fair amount of Flash in my mixes, for TH, and that's made from the stuff that makes black pepper zingy.
Sometimes a coil will misbehave for no apparent reason -- I've been building pretty much the same coil for over 2 yrs, and just recently I had one that delivered juice into my mouth with nearly every draw. I tried several re-wickings, but it wasn't until I finally just replaced that coil with another one made just like it, that the problem stopped. No idea why that one coil was so obstreperous, but who knows. *shrug*
But my RDA delivers such strong, saturated flavor, when I first got it, I could have sworn I was getting juice in my mouth, the flavor was that intense. And even now that I've used it for over a year and am very used to it, I get that flavor-film in my mouth and throat sometimes, and it's kinda icky. I usually drink some water, and maybe switch to a slightly less sweet flavor for a while. Or make my current with less sweetener.
Andria