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  • Addiction - a physical process associated with drug use whereby a person craves a drug; failure to take the drug can result in withdrawal symptoms.
  • Controlled substance - a drug or other chemical compound whose manufacture, distribution, possession, and use are regulated by the legal system
  • Controlled substances act - law that established penalties for possession, use, or distribution of illegal drugs and established five schedules for classifying drugs
  • Dependency - powerful craving for a drug; unlike addiction, dependency does not result in physical withdrawal symptoms upon discontinuation of the drug
  • Depressant - a substance that decreases or inhibits the nervous system, reducing alertness
  • Hallucinogen - a drug that changes a person's perceptions and thinking during intoxication
  • Illegal drug - drug that causes addition, habituation, or a marked change in consciousness, had limited or no medical use, and is listed in Schedule 1 of the US Controlled Substances Act
  • Narcotic - an addictive, sleep-inducing drug, often derived from opium, that acts as a central nervous system depressant and suppresses pain
  • Poison - a natural or manufactured substance that can cause sever illness or death if ingested, inhaled, or absorbed through the skin
  • Stimulant - a substance affecting the nervous system by increasing alertness, attention, and energy, as well as elevating blood pressure, heart rate, and respiration
  • Tolerance - a condition occurring with consistent use of one drug whereby a person needs more and more of the drug to produce the same effect
  • Toxicity - the study of drugs, poisons, toxins, and other substance that harm a person when used for medical, recreational, or criminal purposes
  • Toxin - a substance naturally produced by a living thing that can cause illness or death in humans