In the state of Arizona there was a total of 18,572 Substance Abuse Treatment Admissions during 2010.
This includes males and females from all age groups and all ethnicities. So if you think your alone in your pursuit for sobriety, you need to realize your in the company of many many others.

Here are some stats on the substances that were being used by these individuals.

Alcohol Abuse Only: 3,974
Alcohol and Drug Abuse: 2,229
Cocaine Abuse (Smoked): 445
Cocaine Abuse (Other Route): 344
Marijuana Abuse: 2,773
Heroin Abuse: 2,492
Other Opiate Abuse: 943
Hallucinogen Abuse: 22
Amphetamine Abuse: 2,824
Other Stimulant Abuse: 27
Tranquilzer Abuse: 63
Sedative Abuse: 31
Inhalant Abuse: 6
Other / Unknown: 2,399

Reference: http://wwwdasis.samhsa.gov/webt/quicklink/AZ10.htm