passages.id: 229
passages.type: sentence
passages.text: Approximately two thirds were smokers and were randomized to be tested after either a 12-hr nicotine deprivation or administration of nicotine gum .
entities.id: 230
entities.type: intervention
entities.text: nicotine deprivation
entities.id: 231
entities.type: intervention
entities.text: nicotine
entities.id: 232
entities.type: participant
entities.text: two thirds were smokers