Because they are a sort of water pipe, they are frequently referred to as "water bongs." The smoke created when the herb is heated is filtered by the device by diffusing it through water. Bongs exist in a range of shapes and sizes, but they always have a fundamental structure. A base holds the bowl where the herb is placed, and this is connected by a stem to a filter element made out of glass, plastic, or ceramic. The name "bong" comes from the Indonesian word for nose, which is terang. In addition to smoking herbs, water pipes can be used for smoking tobacco or marijuana. The term "tobacco bong" is often used to describe a water pipe used for smoking tobacco. Smoke inhalation is still possible with a tobacco bong, but less so than with a joint. The term "marijuana bong" is usually used to describe a water pipe used for smoking marijuana. Cannabis has more than twice as much THC (the active ingredient in marijuana) per weight than tobacco, so more marijuana needs to be smoked to achieve a similar effect. Marijuana smokers often choose large quantities to maximize their high. Some people claim that smoking marijuana through a water pipe is healthier because you do not inhale as much smoke. This is not true! Even though some of the smoke is vapor, it is still smoke containing harmful chemicals that can irritate your lungs if you breathe it in too deeply.