Hash oil
Hash oil is a resinous matrix of cannabinoids obtained from the Cannabis plant by solvent extraction, formed into a hardened or viscous mass. Hash oil can be the most potent of the main cannabis products because of its high level of psychoactive compound per its volume, which can vary depending on the plants mix of essential oils and psychoactive compounds. Butane and supercritical carbon dioxide hash oil have become popular in recent years. Infusions
There are many varieties of cannabis infusions owing to the variety of non-volatile solvents used. The plant material is mixed with the solvent and then pressed and filtered to express the oils of the plant into the solvent. Examples of solvents used in this process are cocoa butter, dairy butter, cooking oil, glycerine, and skin moisturizers. Depending on the solvent, these may be used in cannabis foods or applied topically. Marihuana prensada
Marihuana prensada (pressed marijuana) is a cannabis-derived product widespread among the lower classes of South America, especially from the 90s. Locally it is known as "paraguayo" or "paragua", since its main producer is Paraguay. Marijuana is dried and mixed with binding agents that make it toxic and highly harmful to health. It is cut into the shape of bricks (ladrillos) and sold for a low price in Argentina, Brazil, Chile, Peru, Venezuela, and even the United States. History
Ancient history
Cannabis is indigenous to Central Asia and the Indian subcontinent, and its uses for fabric and rope dates back to the Neolithic age in China and Japan.
Endoscopy involves using a fibre-optic flexible camera to identify the phytobezoar, that can be evacuated from the stomach using various assisted devices (such as Roth baskets, snares, or Dormia baskets). If the phytobezoar cannot be removed due to size, electrohydraulic lithotripsy, mechanical lithotripsy, snares, or Nd:YAG laser therapy may be used to fragment the mass. Papain (meat tenderizer) and cellulase enzymes have been used to help reduce the size of phytobezoars. Carbonated soda ingestion has also been found to be useful to decrease the size of diospyrobezoars. A systematic review regarding initial treatment of phytobezoars with Coca-Cola found that Coca-Cola alone completely dissolved phytobezoars in half of cases, and that Coca-Cola combined with other endoscopic methods (particularly endoscopic fragmentation) was successful more than 90% of the time. The same review found that diospyrobezoars (which are considered more difficult to dissolve because of their hard consistency) were successfully treated with Coca-Cola alone in only 23% of cases, but that follow-up endoscopic fragmentation was successful in 84.6% of cases in the publications reviewed. When all other measures have failed, surgical gastrectomy is required to evacuate the bezoar. Physical and chemical properties
Generally, bezoars can be found in the stomach in less than 0.5% of patients having an esophagogastroduodenoscopy. The formation of phytobezoars from persimmons is due to a chemical reaction between stomach acid and phlobatannin contained in the persimmon. Tannin and shibuol found in the skin of unripe persimmons reacts with gastric acid and  forms a coagulum. This structure then accumulates cellulose, hemicellulose and protein.