In the state of Iowa there was a total of 27,843 Substance Abuse Treatment Admissions during 2009.
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: 8,668
Alcohol and Drug Abuse: 6,384
Cocaine Abuse (Smoked): 824
Cocaine Abuse (Other Route): 270
Marijuana Abuse: 7,273
Heroin Abuse: 207
Other Opiate Abuse: 881
PCP Abuse: 3
Hallucinogen Abuse: 32
Amphetamine Abuse: 2,950
Other Stimulant Abuse: 12
Tranquilzer Abuse: 118
Sedative Abuse: 29
Inhalant Abuse: 32
Other / Unknown: 160

Reference: http://wwwdasis.samhsa.gov/webt/quicklink/IA09.htm