I've got a Volcano, and in the month or so I've had it, it's been very good to me. However, it makes me cough like a whooping crane. The first bag can hit me easily, and I'll be off on a 5 minute coughing fest. At first I thought it must be a sign that I am vaping too hot. So, I turned down the Volcano (analog) to 5.5 and I was still getting it. I'm not sure I'd want to go any lower. Chances are, this is all normal and I was foolish to think that vaping would be zerro harsh on the lungs. What have been your experiences?