I just wondered whether anyone else had experienced this while vaping? For the last week or so I've been experiencing it constantly and I think it may be connected to vaping as I tried giving it a rest for half a day and it went away and then started again as soon as I picked up the ecig. It's not exactly excruciating but hurts enough to make me worry. I'd say I'm a mid to heavy vaper using a nicotine strength of 12mg for the past six months. Has anyone else experienced this? Did it pass after a while? Please don't say I have to give up vaping!!!!