@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/substance_use_and_abuse>
  skos:prefLabel "substance use and abuse"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/caffeine>
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/medical_treatments_for_obesity>, <https://concepts.sagepub.com/social-science/concept/drug_classification>, <https://concepts.sagepub.com/social-science/concept/drugs_of_abuse>, <https://concepts.sagepub.com/social-science/concept/nervous_system_stimulants>, <https://concepts.sagepub.com/social-science/concept/health_sciences>, <https://concepts.sagepub.com/social-science/concept/substance_use_and_abuse>, <https://concepts.sagepub.com/social-science/concept/types_of_drugs> ;
  skos:definition "Caffeine is the most widely used psychoactive drug today. According to the latest coffee consumption statistics, coffee is the most popular beverage worldwide with over 400 billion cups consumed each year. [Source: <a href=\"https://sk.sagepub.com/reference/drugpolicy/n53.xml\" target=\"_blank\" data-id=\"to-sk\">Encyclopedia of Drug Policy; Caffeine</a>]"@en ;
  skos:prefLabel "caffeine"@en .

<https://concepts.sagepub.com/social-science/concept/drug_classification>
  skos:prefLabel "drug classification"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/medical_treatments_for_obesity>
  skos:prefLabel "medical treatments for obesity"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/drugs_of_abuse>
  skos:prefLabel "drugs of abuse"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/nervous_system_stimulants>
  skos:prefLabel "nervous system stimulants"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/types_of_drugs>
  skos:prefLabel "types of drugs"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/concepts>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/caffeine> .

<https://concepts.sagepub.com/social-science/concept/health_sciences>
  skos:prefLabel "health sciences"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/caffeine> .