Ulcers on your tongue? I still get them if I'm not careful, I know how uncomfortable they can be.
As Spooky28 says, drink water (or tea etc.) to wash away any nicotine liquid droplets - they are caustic. I get the ulcers if I vape for any length of time without fluids. A longer (or wider opening) mouthpiece/driptip can help too, so you don't get a concentrated jet of juice/vapour hitting your tongue. Don't overdo the vaping, or make sure you drink fluids while doing it.
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