If you say that someone is an addict, you mean that they like a particular activity very much and spend as much time doing it as they can. She is a TV addict and watches as much as she can
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 news junkie"
to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)