[1] : WordNet (r) 2.0

drug addict
     n : a narcotics addict syn: junkie, junky
see also:
junkie junky 

[2] : Moby Thesaurus II by Grady Ward, 1.0

32 moby thesaurus words for "drug addict":
   lsd user, acidhead, addict, alcoholic, chain smoker,
   cocaine sniffer, cokie, cubehead, dipsomaniac, dope fiend, doper,
   drug abuser, drug user, drunkard, fiend, freak, glue sniffer,
   habitual, head, heavy smoker, hophead, hype, junkie,
   marijuana smoker, methhead, narcotics addict, pillhead, pothead,
   snowbird, speed freak, tripper, user

Addict >> A Words
Addict, definition of term: Addict
addict_pag1.html

Drug >> D Words
Drug, definition of term: Drug
drug_pag1.html

Drug Trafficker >> D Words
Drug Trafficker, definition of term: Drug Trafficker
drug+trafficker_pag1.html

Drug Addiction >> D Words
Drug Addiction, definition of term: Drug Addiction
drug+addiction_pag1.html

Drug Abuse >> D Words
Drug Abuse, definition of term: Drug Abuse
drug+abuse_pag1.html

Designer Drug >> D Words
Designer Drug, definition of term: Designer Drug
designer+drug_pag1.html