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Wordage.info / addict

Exact Match:

someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
someone who is so ardently devoted to something that it resembles an addiction; "a golf addict"; "a car nut"; "a bodybuilding freak"; "a news junkie"
to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)