addiction: A state of chemical dependency. Addiction produces a noticeable effect on the body and causes withdrawal symptoms when the user stops using the chemical.

amphetamine: A stimulant that speeds up the central nervous system.

anabolic steroid: A drug that produces greater muscle mass and strength.

aromatherapy: A process in which people inhale warmed essential oils derived from plants believed to have tranquilizing and stress-relieving properties.

chemical dependency: A physical or psychological need for a chemical that is taken for nonmedical reasons.

cocaine: A stimulant that speeds up the nervous system and produces feelings of euphoria.

cortisol: A chemical produced by the brain that helps the body deal with stress.

D.A.R.E. or Drug Abuse Resistance Education: A drug abuse prevention program offered in schools throughout the world.

denial: A state in which chemically dependent people refuse to admit that they have a problem.

depressant: A...