A new study released by the Substance Abuse and Mental Health Services Administration (SAMHSA) says that about half of all addiction-treatment patients are addicted to both alcohol and other drugs.

According to data from the 2005 National Survey of Substance Abuse Treatment Services, 47 percent of treatment clients had addiction to both alcohol and illicit drugs, 34 percent were admitted for illicit-drug addiction only, and 19 percent were addicted to alcohol only.

Researchers found that 22 percent of treatment clients in the 2005 report were being treated with methadone.

The report is a snapshot of clients enrolled in treatment on a single day: March 31, 2005.

A total of 14,047 facilities responded to the 2005 survey.