Getting the right draw from the vaporizer may take a little practice. Drawing from the vaporizer is done by holding the hand piece next to the heating element. The tube with the mouthpiece goes into your mouth. As you draw from the vaporizer heat is drawn over the herbs, heating them and creating vapor that travels through the tube into your lungs. After each draw remove the hand piece from the heating element to avoid heating the herbs excessively. Draw quickly from the vaporizer to avoid burning the herbs, resulting in smoke. If you can control the temperature of the vaporizer to cool it somewhat you can draw slower. Replace used-up herbs with fresh when the herbs turn from green in color to brown or black, if you detect a burnt popcorn taste, or if the vapor stops.