"In 2017, 30.5 million people aged 12 or older used an illicit drug in the past 30 days (i.e., current use), which corresponds to about 1 in 9 Americans (11.2 percent). About 1 in 4 young adults aged 18 to 25 were current illicit drug users. Regardless of age, the estimates of current illicit drug use for 2017 were driven primarily by marijuana use and the misuse of prescription pain relievers.