The Oxford Thesaurus An A-Z Dictionary of Synonyms - addictn.

1) (habitual) user, Slang junkie, dope-fiend, doper, head, pot-head, acid-head, pill popper, tripper, Chiefly US hophead: His contributions helped set up the halfway houses for addicts. 2) devotee, aficionado, fan, admirer, follower, adherent, supporter, enthusiast, Colloq buff, hound, fiend, groupie, Slang freak, bug, nut, teeny-bopper: She became a rock 'n' roll addict in the '60s.