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addiction (ә-dik´shәn)   the state of being given up to some habit or compulsion.
  strong physiological and psychological dependence on a drug or other agent; see alcoholism and drug dependence.
 

drug addiction  a state of heavy dependence on a drug; sometimes defined as physical dependence but usually also including emotional dependence (compulsive or pathological drug use). It is often used synonymously with drug dependence.





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