I went up from 12 mg to 28 mg to see if it might work better for me. Funny thing is, I vaped just as much at 28 as I did at 12. I think I'm more addicted to blowing smoke/vapor than to nicotine. As an ultra-light smoker in the past, my head was singing on the 28, but the other night, something unexpected happened.. I got the heaves. Now I'm not saying for sure that too much nicotine was responsible, but I'm not known for random acts of spewage, so maybe it was the nicotine? ...