[1] : WordNet (r) 2.0

drug addiction
     n : an addiction to a drug especially a narcotic drug syn: white
         plague
see also:
white plague 

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

25 moby thesaurus words for "drug addiction":
   a habit, acquired tolerance, acute alcoholism, addictedness,
   addiction, alcoholism, amphetamine withdrawal symptoms,
   barbiturate addiction, barbiturism, chain smoking,
   chronic alcoholism, cocainism, crash, craving, dependence,
   dipsomania, drug culture, drug dependence, habituation,
   nicotine addiction, physical dependence, psychological dependence,
   tolerance, withdrawal sickness, withdrawal symptoms

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

Addiction >> A Words
Addiction, definition of term: Addiction
addiction_pag1.html

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

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

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

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