Hašiš

Hashish resin contains ingredients such as tetrahydrocannabinol (THC) and other cannabinoids, though often in higher concentrations than the unsifted or unprocessed cannabis flower. The 1961 UN Single Convention on Narcotic Drugs defines hashish as "the separated resin, whether crude or purified, obtained from the cannabis plant". The flowers of a mature female plant contain the most trichomes, though trichomes are also found on other parts of the plant. The THC content of hashish ranges widely, from almost none to 65%. Hashish can also contain appreciable amounts of CBD, CBN and trace amounts of other cannabinoids.

As a psychoactive substance, hashish is typically consumed by smoking or vaporizing, either plain or mixed with tobacco, but it can also be consumed orally.

The chemical constituents of Cannabis include about 120 compounds responsible for its characteristic aroma, mainly volatile terpenes and sesquiterpenes. The characteristic flavour of hashish has been linked to a rearrangement of myrcene during the process of manufacture. Humulene contributes to the characteristic aroma of Cannabis sativa. Humulene is an isomer of β-caryophyllene, and the two are often found together as a mixture in many aromatic plants. Myrcene is a monoterpene and a colorless oil that occurs widely in essential oils. In cannabis flower essential oil, myrcene makes up 29.4 to 65.8% of the total and trans-caryophyllene 3.8 to 37.5%.

Smell is the most common indicator of the quality of hash. Adulterants introduced during production reduce the purity of the material and often give a green finished product.

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