In the state of California there was a total of 181,386 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: 23,284
Alcohol and Drug Abuse: 19,832
Cocaine Abuse (Smoked): 12,290
Cocaine Abuse (Other Route): 2,903
Marijuana Abuse: 34,597
Heroin Abuse: 28,404
Other Opiate Abuse: 8,381
PCP Abuse: 676
Hallucinogen Abuse: 89
Amphetamine Abuse: 49,422
Other Stimulant Abuse: 149
Tranquilzer Abuse: 344
Sedative Abuse: 275
Inhalant Abuse: 122
Other / Unknown: 618

Reference: http://wwwdasis.samhsa.gov/webt/quicklink/CA09.htm