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substance abuse

long-term, pathological use of alcohol or drugs, characterized by daily intoxication, inability to reduce consumption, and impairment in social or occupational functioning; broadly, alcohol or drug addiction. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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substance-abuse in Medicine

substance abuse n.
Excessive use of a potentially addictive substance, especially one that may modify body functions, such as alcohol and drugs. Also called chemical abuse.

substance abuser n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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