9781422282540

WORDS TO UNDERSTAND

chronic: something that recurs for a long time and doesn’t get better. diversion: when something changes course; in this context, when a drug created for medical purposes ends up used in some other way. euphoria: great, almost overwhelming, pleasure. neurotransmitter: a chemical in the brain that carries signals. patent: a government document that certifies ownership of a unique invention or process. regulations: rules that limit what companies or individuals are allowed to do. sedatives: chemicals that are calming or cause sleep. stimulants: chemicals that increase energy and wakefulness.