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Cannabis () is a genus of flowering plant that includes three species (and seven taxa) or subspecies,sativa, indica, and ruderalis. The plant is indigenous to central Asia and the Indian subcontinent.
Cannabis has long been used for hemp fibre, for hemp oils, for medicinal purposes, and as a recreational drug. Industrial hemp products are made from cannabis plants selected to produce an abundance of fiber. To satisfy the UN Narcotics Convention, some cannabis strains have been bred to produce minimal levels of tetrahydrocannabinol (THC), the principal psychoactive constituent. Many plants have been selectively bred to produce a maximum of THC (cannabinoids), which is obtained by curing the flowers. Various compounds, including hashish and hash oil, are extracted from the plant. Globally, in 2013, 60,400 kilograms of cannabis were produced legally. In 2013 between 128 and 232 million people are thought to have used cannabis as a recreational drug (2.7% to 4.9% of the global population between the ages of 15 and 65).
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A
gravity bong is a method of consuming smokable substances such as
cannabis and
tobacco. The term describes both a bucket bong and a waterfall bong, since both use gravity and water to develop smoke. The bucket bong is made out of two containers, with the larger, open top container filled with water. The smaller has an attached
bowl and open bottom, and the smaller is placed into the larger. Once the bowl is lit, the operator must move the small container up, causing a pressure difference. Smoke slowly fills the small jar until the user removes the bowl and inhales the contents. A waterfall bong is made up of only one container. The container must have a bowl and a small hole near the base so the water can drain easily. As the water flows out of the container, air is forced through the bowl and causes the substance to burn and accumulate smoke in the bong. The bong is typically used for smoking cannabis and is generally not recommended for smoking
tobacco or other herbal substances. The bong is, however, often marketed for use of tobacco. Internationally, the sale of gravity bongs is often prohibited in countries where marijuana is illegal due to its association with the herb.
