I at first got her to get a bottle of play hers at 18mg and I guess the house ratio of 70/30 pg/vg. Way too harsh for her and she complained of headaches. So I mixed her up some watermelon, which she really likes, at 30/70 and 12mg. It's much easier for her to handle, but still some burning, and some headaches. She was a half a pack a day smoker. Is she allergic to pg, or do I need to go really low on nic?