Okay. There is another variable. I used the wrong concentrate. Meaning, I reached for the cigar type and ended up putting a biscuit concentrate in instead. That messed things up beyond repair to begin with. But neither concentrate contains nicotine (according to the labels). However, that biscuit concentrate feels like it has nicotine in it. It's that unmistakable feeling of inhaling too much nic. I don't know if a concentrate can make you feel like that. But as tasty as it is, I don't enjoy the feeling I get off it.