http://www.policyalmanac.org/crime/archive/drug_abuse.shtmlMarijuana is the most commonly used illicit drug. In 2001, it was used by 76 percent of current illicit drug users. Approximately 56 percent of current illicit drug users consumed only marijuana, 20 percent used marijuana and another illicit drug, and the remaining 24 percent used an illicit drug but not marijuana in the past month. Therefore, about 44 percent of current illicit drug users in 2001 (7.0 million Americans) used illicit drugs other than marijuana and hashish, with or without using marijuana as well.
Of the 7.0 million current users of illicit drugs other than marijuana, 4.8 million were current users of psychotherapeutic drugs. This represents 2.1 percent of the population aged 12 or older, which was higher than the rate observed in 2000 (1.7 percent). Of those who reported current use of any psychotherapeutics, 3.5 million used pain relievers, 1.4 million used tranquilizers, 1.0 million used stimulants, and 0.3 million used sedatives.
In 2001, an estimated 1.7 million (0.7 percent) of Americans aged 12 or older were current cocaine users and 406,000 (0.2 percent) were current crack users.
Approximately 1.3 million (0.6 percent) of the population aged 12 or older were current users of hallucinogens.
In 2001, an estimated 8.1 million (3.6 percent) of Americans aged 12 or older had tried "Ecstasy" at least once in their lifetime. This is more than the estimated 6.5 million (2.9 percent) lifetime users in 2000. The number of current users in 2001 was estimated to be 786,000 (0.3 percent). The 2000 NHSDA was not designed to report past month or past year use of Ecstasy.
In 2001, approximately 957,000 persons aged 12 or older had used Oxycontin nonmedically at least once in their lifetime. This number is higher than estimates from both 1999 (221,000) and 2000 (399,000). The NHSDA was not designed to report past month or past year use of Oxycontin.
Current heroin use was reported by an estimated 123,000 Americans in 2001. This represents 0.1 percent of the population aged 12 or older and is similar to the number estimated for 2000 (130,000).