I use a CE4 Vision Elegance and Vision 2 Clearomizer.
I will sometimes get a drop or smear on my lips and it feels and tastes funny.
On my tongue, it goes numb like Anbesol ... (which isn't all that bad) lol
I have only gotten a good amount in my mouth once when I replaced a wick.
I "Prime" them lightly before put together. I tilted it up to get the wick wet so I
wouldn't burn it and when I drew on it, it ran into my mouth.
That was nasty!
I have only had a drop on occasion and I suspect that is from vapor that is caught
in the tip and after it cools, it has turned back to liquid state in the tip.
One other time was when my tip wasn't meeting the rubber nipple properly and it
leaked into the mouthpiece tip.