passages.id: split_5_test_2471_passage
passages.type: progene_text
passages.text: We detected a significantly higher frequency of T / T homozygotes ( p < 0.025 ) in subjects who had never smoked ( 15 of 60 , 25.0 % ) as compared to smokers and past smokers ( 6 of 75 , 8.0 % ) .