I agree with Mustang. Usually if you overfill something, it will leak into your mouth. If it's a tank with a cartomizer, it's something that can happen from time to time. I use carto tanks a lot as well, and when I switch to a new carto, I give it a primer fill to get it started. I sometimes overdo and it leaks for the first little bit until I've taken a few drags. I usually just wash it down with whatever I'm drinking and call it good. No adverse effects as of yet, though I don't recommend doing that. If it's so gurgly that you're not getting any vapor as well, you may have to shake it out really good to get any excess juice out. As well, take it off your eroll battery, put a paper towel up to the threaded end, and blow through the mouthpiece. That can also help clear one out. Hope this helps.