addiction: A chronic, relapsing disease characterized by compulsive drug seeking and abuse and by long-lasting neurochemical and molecular changes in the brain.
adrenal glands: Glands located above each kidney that secrete hormones, e.g., adrenaline.
craving: A powerful, often uncontrollable desire for drugs.
dopamine: A neurotransmitter present in regions of the brain that regulate movement, emotion, motivation, and feelings of pleasure.
emphysema: A lung disease in which tissue deterioration results in increased air retention and reduced exchange of gases. The result is difficulty breathing and shortness of breath.
hyperglycemic: The presence of an abnormally high concentration of glucose in the blood.
neurotransmitter: A chemical that acts as a messenger to carry signals or information from one nerve cell to another.
nicotine: An alkaloid derived from the tobacco plant that is responsible for smoking's psychoactive and addictive effects.
pharmacokinetics: The pattern of absorption, distribution, and excretion of a drug over time.
rush: A surge of euphoria that rapidly follows administration of some drugs.
tobacco: A plant widely cultivated for its leaves, which are used primarily for smoking; the N. tabacum species is the major source of tobacco products.
withdrawal: A variety of symptoms that occur after chronic use of an addictive drug is reduced or stopped.
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