...  about twice as much in medical and worker compensation claims as their drug-free coworkers. Marijuana is the most commonly used illicit drug. In 2001, it was used by 76% of current illicit drug users. In 2001, an estimated 15.9 million Americans ages 12 or older were current illicit drug users, meaning they had used an illicit drug during the month prior to the survey interview. This estimate represents 7.1% of the population ages 12 years old or older. The percentage of the population using illicit drugs increased from 6.3% in 1999 and 2000 to 7.1% in 2001. Between 2000 and 2001, statistically significant increases were noted for the current use of marijuana (4.8 to 5.4%), cocaine (0.5 to 0.7%), pain relievers (1.2 to 1.6%), and Tranquilizers (0.4 to 0.6%). There were 19,102 deaths from drug-induced causes in 1999 (legal and illegal drugs). The number of persons with Drug Addiction problems increased from 14.5 million (6.5 percent of the population) in 2000 to 16.6 million (7.3%) ...