I've been vaping for a little over a year now and have enjoyed it very much and without incident. Recently though, I have developed a rather tedious bout of insomnia, which has resulted in my vaping much more than usual. Since, I have begun to experience a very sore tongue, which is quite red and almost shiny. And, to make matters worse, my entire mouth is very dry, (I'm not producing hardly any saliva). To complete this unhappy picture, I have an absolutely vile taste in my mouth that cannot be removed by any measure. No one other thing in my routine has changed, diet..medicine...nothing, and I continue to Vape the same familiar varieties of ejuice at the same level of nicotene (3 mg.). Is it possible, since beginning to Vape almost nonstop, am I developing toxic levels of nicotene? I can't imagine such, since I used to go in binges when I would smoke where I would chain smoke; regular, mentholated tobacco....with no ill effects, other than a possible headache and cough occasionally. If ANYONE can help me figure this out, I would be very very grateful! My thanks in advance!