Kief, sometimes transliterated as keef, also known as "Dust" and "Chief" a.k.a. cannabis crystals among other names, refers to the accumulation of detached cannabis trichomes, typically collected by sifting cannabis flowers through a fine mesh screen or sieve. Like some other cannabis concentrates, it contains a much higher concentration of THC and other psychoactive cannabinoids than that of the cannabis flower from which it is derived. Since it contains a higher level of THC, many consumers choose to add collected kief to their cannabis for a more intense "high"; by the same token, this preparation may induce unwelcome levels of intoxication.