From Longman Dictionary of Contemporary Englishdrug addictˈdrug ˌaddict noun [countable] MDDsomeone who cannot stop taking illegal drugs —drug addiction noun [uncountable]
Examples from the Corpus
drug addict• In other words, this therapist was an alcoholic and a drug addict.• At 17 he was a drug addict.• The Marquis of Blandford, a former drug addict, married Becky in 1990.• What is the welfare of the drug addict, under the influence of the drug? 