Loose Leaf Vaporizers function by heating up the dry material to the perfect temperature settings where the active ingredients are released without burning any material. When any plant material is burned, combustion occurs and smoke is produced. Many people are now beginning to become aware that when combustion occurs, there are thousands of toxins being produced and then inhaled into your lungs. Many of these chemicals include carcinogens that can be harmful to you and potentially lead to long-term health problems.