The addiction treatment and recovery system in the United States is massive. The industry comprises approximately 15,000 public and private service units with more than 1.3 million persons in care at any point in time. Some 24 million people are in long-term recovery, having benefited from treatment, recovery support and/or a variety of mutual aid organizations. Considerable innovation occurs regularly in the system, including motivational/cognitive-behavioral approaches, recovery community organizations, and harm reduction strategies such as needle exchange and naloxone distribution.