The following list of drugs and substances are the most commonly abused in the United States, according to the National Institute of Drug Abuse.

Click on the links for information about how these drugs are used, their commercial or street names, their intoxication effects and potential health consequences.

Cannabinoids

* Hashish
* Marijuana

Depressants

* Barbiturates
* Benodiazepines
* Flunitrazepam (Rohypnol)
* GHB
* Methaqualone (Quaaludes)

Dissociative Anesthetics

* Ketamine
* PCP

Hallucinogens

* LSD
* Mescaline
* Psilocybin

Opioids and Morphine Derivatives

* Codeine
* Fentanyl
* Heroin
* Morphine
* Opium

Stimulants

* Amphetamine
* Cocaine
* Ecstacy (MDMA)
* Methamphetamine
* Methylphenidate (Ritalin)
* Nicotine

Other Compounds

* Anabolic Steriods
* Inhalants

For more info go to: http://alcoholism.about.com/cs/drugs/f/drug_faq01.htm