addiction to drugs.
substance abuse involving drugs.
Origin of drug abuse
First recorded in 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Habitual use of drugs to alter one's mood, emotion, or state of consciousness.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.