He's been difficult to dial in. He says he truly wants
vaping to work but what we've tried thus far hasn't satisfied enough to keep him off the smokes, though I'm sure A LOT of it has to do with willpower. Always airflow turned way down, different resistances from about 0.75 to 1.8 and nic from 6-18 commercial and DIY and he still coughs a bit. We are both pretty hopeful that something with more restrictive airflow will be more to his satisfaction.