#head.drug_user  (informal) a user of (usually soft) drugs; "the office was full of secret heads"
  supertype:  #drug_user__substance_abuser__substanceabuser__user  a person who takes drugs
  subtype:  #acid_head  someone who takes LSD
  subtype:  #hash_head  a user of hashish
  subtype:  #pill_head  a consumer of amphetamine pills
  subtype:  #pothead  someone who smokes marijuana habitually

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