Smoker:smoker,nonsmoker
Cancer:present,absent
Bronchitis:present,absent
Bronchitis,Cancer,Smoker
absent,absent,nonsmoker,35
absent,absent,smoker,18
absent,present,nonsmoker,0
absent,present,smoker,2
present,absent,nonsmoker,15
present,absent,smoker,27
present,present,nonsmoker,0
present,present,smoker,03