Have you ever wondered what drinking alcohol would do to your body? Have you ever questioned why a person would have a tough time quitting drugs or alcohol even when they really want to? Find out the facts about these and many other related topics.

Alcohol - A depressant that slows down the activity of the brain and other parts of the nervous system.

Amphetamines - Stimulants, sometimes called "uppers," that increase the activity of the nervous system.

Cocaine - A stimulant, extracted from the leaves of the coca plant, that increases the activity of the nervous system.

Ecstasy - A stimulant, often associated with all-night dance parties or "raves," that increases the activity of the nervous system can also cause hallucinations.

GHB (Gamma-Hydroxybutyric Acid) - A depressant that slows down the activity of the brain and other parts of the nervous system.

Growth Hormone - A natural hormone produced by the brain that stimulates the growth of muscle and bone.

Heroin - A natural painkiller produced by the seed pods of the opium poppy plant.

Inhalants - Substances found in various household products that were never meant to be used as drugs. Most (but not all) inhalants are depressants that slow down the activity of the brain and other parts of the nervous system.

LSD (Lysergic Acid Diethylamide) - A powerful hallucinogenic drug that was first synthesized in 1938.

Marijuana - Marijuana is a depressant that slows down the activity of the brain and other parts of the nervous system. This inhibitory action has a relaxing or calming effect that causes people to feel "high".

Methamphetamine - As its name implies, methamphetamine is a member of the amphetamine class of drugs. Methamphetamine shares many properties with other amphetamines, which are stimulants that increase the activity of the nervous system.

Prescription Painkillers - Drugs that doctors prescribe to patients who suffer from intense pain. Drugs in this class are called opioids.

Prescription Sedatives/Tranquilizers - A group of drugs that work by slowing down the normal activitites of the brain.

Shrooms - A class of natural mushrooms containing the active chemical psilocybin that produce hallucinations when you eaten.

Steroids (Anabolic) - These kinds of steroids stimulate muscle growth and decrease the amount of body fat.

Tobacco - One of the most widely used addictive substances in the world. More people use tobacco than all illegal drugs combined, because it contains a highly addictive drug called nicotine. When tobacco is smoked, chewed, or inhaled, nicotine is rapidly absorbed into the bloodstream and exerts a variety of effects on the body.