Agree with Danny; have never seen a problem with WL's nic. I notice odd symptoms when I mix over ~20% pg. So, unless you're heavily invested in pg nic, how about ordering off for vg nic? If that cures your symptoms, great! Just give away your pg nic. If not, then you'll have a little more nic that you'll use eventually. And yeah, try mixing with some saline solution. I mix using 5% of the 0.9% solution -- though others go up to 10%. Make sure you get one without preservatives or other junk. I prefer the sterile solution made by Baxter (though apparently there's have a shortage...).