The state health department released its 10-year report on alcohol and drug treatment services.
The study covers from 2003 through 2012.
Researchers found that marijuana was the primary substance used by the majority of adolescents (52.8 to 63.1 percent) admitted to drug treatment services. Alcohol came in second with 26.9 to 39.9 percent of youth admissions.
For adults 18 to 49 years, methamphetamine, also known as "ice" was the most frequently reported primary substance (42.4 to 53.2 percent) followed by alcohol (21.8 to 31.5 percent).
Alcohol was the most frequently used primary substance for adults 50 years and older (52.2 to 64.4 percent).
Among the discharged cases, the majority completed treatment with no drug use or with some drug use. About one quarter of the cases left the facility before completing treatment and 12.4 to 14.7 percent were discharged due to non-compliance with program rules. A very small percentage of clients were incarcerated or died while receiving treatment.