
Keywords: 4- (methylnitrosamino) -1- (3-pyridyl) -1-butanol; 8-oxodGuo; 8-oxo-7,8-dihydro-2â²-deoxyguanosine; Cr; creatinine; ESI; electrospray ionization; ETS; environmental tobacco smoke; LC-MS/MS; liquid chromatography-tandem mass spectrometry; LOD; limit of detection; NNAL; 4-(methylnitrosamino)-1-(3-pyridyl)-