In the state of Washington D.C. there was a total of 3,160 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: 360
Alcohol and Drug Abuse: 335
Cocaine Abuse (Smoked): 483
Cocaine Abuse (Other Route): 38
Marijuana Abuse: 509
Heroin Abuse: 1,188
Other Opiate Abuse: 46
PCP Abuse: 188
Hallucinogen Abuse: 0
Amphetamine Abuse: 4
Other Stimulant Abuse: 1
Tranquilzer Abuse: 3
Sedative Abuse: 0
Inhalant Abuse: 0
Other / Unknown: 5

Reference: http://wwwdasis.samhsa.gov/webt/quicklink/DC10.htm