In order to use THC vape juice, you must have a vaporizing device. Vaping refers to the process of heating a cannabis product without burning it. When the product is heated, active ingredients, such as THC, are released in a mist format. Smoke is not released during this process because no combustion occurs with the vaporizing device. Vaporizing, or vaping, is thought to be a better alternative to smoking because it may help reduce the ingestion of tar, ammonia and carcinogens that can be found in cannabis smoke. It also may have a smaller respiratory impact than smoking.