My good friend has a Volcano Vaporizer and I use it all the time. The whole this is great. He has the solid valve. You just turn the knob somewhere between 3 and 5 and let it heat up. Once it's heated up then fill the bag with air and inhale. Works great every time no smell as long as you don't let too much air out in the beginning. I vaped in my room at home and got no comments about the smell.