Hey all, how's things? I have a bit of a strange query here...I gave up Cigarettes two and a half months ago, first with a pen type ecig, and now with a tank. I havent touched a cigarette since, after smoking 20 a day for approx 20 years.I started out on 18mg of nicotine, but two days ago, I dropped to 12 mg. The strange thing is, today my jaw is clenching all day, and it has got worse as the day has gone on!!! Has anyone else experienced this? Could it be down to dropping Nicotine levels? Or maybe vaping too much to make up for the lower levels?Any suggestions will be greatly appreciated.