hard drugs
From Longman Dictionary of Contemporary EnglishRelated topics: Drug culturehard drugsˌhard ˈdrugs noun [plural] MDDDRUGvery strong illegal drugs such as heroin and cocaine → soft drugExamples from the Corpushard drugs• The linking of alcohol and hard drugs confuses health education messages.• Dealing in drugs, particularly hard drugs, is not an activity condoned by any of the community organisations on the estate.• Is it fair to equate alcohol with hard drugs?