Read the instructions!!
I purchased the "B" model as I am a beginner. Only after watching many videos on the correct way to heat the thing up, did I finally got the hang of it. Once figured out I have to say I have never had so pleasurable an experience smoking, and I should know as I have been smoking since 1972. I'm 68 years old and I have had 5 types of cancer. The biggest problem I have is that I'm on social security and a fixed income so in order to take the next step I have to buy something I cannot afford. I beg you to lower your prices as I need to move on.