Patterns of Drug Use
The
illegal use of psychoactive drugs is extensive in the United States. Some 78 million Americans
age 12 and over have tried at least one or more prohibited drugs for the purpose of getting high. The illegal drug trade represents an enormous economic enterprise, with annual gross sales estimated to be $40 to $100 billionÑmore than the total net sales of the largest U.S. corporation. About 60 percent of the illegal drugs sold worldwide end up in the United States.
By far the most commonly used illegal drug is
marijuana. Roughly half of the total of all illegal drug use involves marijuana alone. There was a substantial decline in all measures or levels of marijuana use throughout the 1980s. In 1979, 31% of 12- to 17-year-olds and 68% of 18- to 25-year-olds had at least tried marijuana; by 1990 the comparable figures had shrunk to 15% and 52%. Since 1990 the use of marijuana has risen significantly, especially among schoolchildren. In 1990, 27% of high school seniors had used marijuana during the past year, while in 1996 this was 36 percent; the rise among eighth- and tenth-graders was even sharper. Cocaine is the second most commonly used illegal drug in the United States. In 1995 there were roughly 1.5 million monthly or more cocaine users in the United States, a decline from 5.7 million in 1985. Heroin is less widely used, but it has been used at least once by roughly one American in 100.
Most people who have taken illegal drugs have done so on an experimental basis. They typically try the drug once to a dozen times and then cease using it. Of all illegal drugs, marijuana is the one users are most likely to continue using. Discontinuation rates are very high for drugs such as methaqualone, sedatives, barbiturates, heroin, and LSD. Even most
regular users of illegal drugs are moderate in their use. The typical regular marijuana smoker is an occasional user. Still, a sizable minority does use the drug frequently, to the point of abuse. In 1996 about 5% of all high school seniors used marijuana daily or nearly daily (20 or more times in 30 days). A pattern of episodic, regular use characterizes nearly all drug use for the purpose of recreation. This does not deny the problem of the heavy, chronic abuser of these drugs.