a drug, usually illicit, that does not produce significant psychological or physical dependence.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A drug considered to be nonaddictive and less damaging to the health than a hard drug.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.