Not very much. I just have a FT Squape clone and I used it for maybe a week. The draw on it is terrible and I like a tight draw. I found that if I reduced the size of the wick, I could increase it a bit but never enough. It is sitting in my drawer now. Don't think I will ever use it again unless I decide to try to drill out the air hole. Also, I found that it gave me a sore
throat after about an hour.