I use a VaporPenz Natural. I'm actually pretty happy with it. It only combusts if I hold down the button for too long. It had a bit of a learning curve figuring out how long to hold the button down for. Typically, not more than 20 seconds. It takes about a pinch of weed and I get about 3-4 hits every time I fill it. It's not a great conserver but I'm still going through less weed than I did with my pipe. I bought an 1/8th about three weeks ago, hit my vapor pen every night, and still have not used up the 1/8th. I only was burning the flowers at first. Now I've got some nice brown AVB that I'm saving.