Dealers sometimes cut hash oils with other oils. The tetrahydrocannabinol (THC) content of hash oil varies tremendously, since the manufacturers use a varying assortment of marijuana plants and preparation techniques. Cannabis retailers in California have reported about 40% of their sales are from cannabis oils. Hash oil may be sold in cartridges used with pen vaporizers.

It is generally thought to be indistinct from traditional hashish, according to the 1961 UN Single Convention on Narcotic Drugs (Schedule I and IV), as it is 'the separated resin, whether crude or purified, obtained from the cannabis plant'. Hash oil is an extracted cannabis product that may use any part of the plant, with minimal or no residual solvent. There are various extraction methods, most involving a solvent, such as butane or ethanol. Color most commonly ranges from transparent golden or light brown, to tan or black. Preparations of hash oil may be solid or colloidal depending on both production method and temperature and are usually identified by their appearance or characteristics. Hash oil is usually consumed by smoking, vaporizing or eating. It is a cannabis concentrate containing many of its resins and terpenes – in particular, tetrahydrocannabinol (THC), cannabidiol (CBD), and other cannabinoids. Hash oil or cannabis oil is an oleoresin obtained by the extraction of cannabis or hashish.

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