I still like to vape, but for the passed month or so, i've been getting some pretty nagging headaches from it. After about 3 hits, the headache starts. But i'm addicted to these things now (or still), so i put up with them. I'm on 12mg nic, 70/30 PG/VG, and tried to drop to 6mg but with little-to-no TH, I couldn't even make it through a tank lol I've been vaping the same brand/mix/flavor for quite some time, not sure what's changed. I've always vaped a pretty consistent amount daily, I'm surprised that my headaches are coming from too much nicotine all of a sudden. I mean nothing's changed from before a month ago, why now all of a sudden? Seems logical to me that if my nic level/amount/daily intake hasn't changed, then my tolerance shouldn't change either. Do any vendors sell a 10mg nic or know a trick to put some flavor/kick to a 6mg juice?