Usely 50/50 pg-vg is a good way to start.
Nic level 18, perhaps 12 isnt enough and your having to vape more often,
Than again as I recall when first started I was hitting pretty hard cause I was use to using ciggs.
Stick with it, you'll get use to it soon.
I kept a pack of ciggs on hand at first, though a pack lated a few weeks.
Want be long youll not need ciggs period.
Jim