chemical dependency

noun
addiction to drugs or alcohol.
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American Heritage
Medical Dictionary

chemical dependency n.
A physical and psychological habituation to a mood- or mind-altering drug, such as alcohol or cocaine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
They add that therapies designed to prevent this from happening during drug use
  could one day help to thwart chemical dependency.
The legislature recognizes chemical dependency professionals as discrete health
  professionals.
Annual re-certification of chemical dependency treatment providers.
Annual re-certification of chemical dependency treatment providers.
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