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substance abuse

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noun
  1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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substance abuse in Medicine

substance abuse

n.
  1. Excessive use of a potentially addictive substance, especially one that may modify body functions, such as alcohol and drugs.chemical abuse
Related formssubstance abuser n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.