a person who does not use or partake of something, as drugs or alcoholic beverages.
Origin of nonuser
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for nonusers
Historical Examples of nonusers
High school seniors who are heavy drug users are more than three times as likely to skip school as nonusers.What Works: Schools Without Drugs
United States Department of Education