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Kief (pronounced [keːf, ki(ː)f, kɪf]; from Arabic كيف (kayf) 'pleasure'), sometimes transliterated as keef, also known as cannabis crystals among other names, refers to the resinous trichomes of cannabis that may accumulate in containers or be sifted from loose, dry cannabis infructescences with a mesh screen or sieve. Like some other cannabis concentrates, it contains a much higher concentration of THC and other psychoactive cannabinoids, such as than that of the cannabis infructescences from which it is derived. Due to the fact that it contains a higher level of THC many consumers choose to add collected kief to their marijuana for a more intense "high"; by the same token, this preparation may induce unwelcome levels of intoxication.
Traditionally, kief has been pressed into cakes of hashish for convenience in storage, although it can be vaporized or smoked in either form. After the kief is collected it is heated and pressurized, resulting in hashish.
In Morocco, kief also refers to a traditional mix of finely-chopped marijuana and indigenous tobacco, which is distinctly different from trichome powder. It is usually smoked in a long pipe called a sebsi. In other countries, such as the US and those of Western Europe, kief is used to make products via infusions. Some examples are baked cookies or brownies or other edibles. Due to its potency, however, some consumers use only a small quantity of kief in order to limit its effects. 
Approximately one gram of screen-sifted cannabis trichomes, commonly referred to as kief
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- What is kief?
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