"an estimated 12.8 million Americans, about 6 percent of the household population aged twelve and older, use illegal drugs on a current basis (within the past thirty days). This number of "past-month" drug users has declined by almost 50 percent from the 1979 high of twenty-five million -- a decrease that represents an extraordinary change in behavior. Despite the dramatic drop, more than a third of all Americans twelve and older have tried an illicit drug. Ninety percent of those who have used illegal drugs used marijuana or hashish. Approximately a third used cocaine or took a prescription type drug for nonmedical reasons. About a fifth used LSD. Fortunately, nearly sixty million Americans who used illicit drugs during youth, as adults reject these substances."