If you're new to hookah, you may be wondering what a hookah diffuser is and why you would need one. A hookah diffuser is a small piece of equipment that fits onto the stem of your hookah. Its main purpose is to diffuse the hookah smoke, making it smoother and cooler. It also helps to reduce the amount of tar and nicotine in the smoke. Diffusers are made from a variety of materials, including metal, silicone, and ceramic. Some hookahs come with a diffuser built-in, but you can also buy them separately. Whether or not you use a diffuser is entirely up to you; it's just a matter of personal preference. Many hookah smokers enjoy the added smoothness and flavor that a diffuser provides.