Do you guys ever actually read the stiueds you cite?Here's the one you seem to be talking about:Bessette et al., 2010Identification of Carcinogen DNA Adducts in Human Saliva by Linear Quadrupole Ion Trap/Multistage Tandem Mass Spectrometry DNA adducts of carcinogens derived from tobacco smoke and cooked meat were identified by liquid chromatography−electrospray ionization/multistage tandem mass spectrometry (LC-ESI/MS/MSn) in saliva samples from 37 human volunteers on unrestricted diets . In other words, it's not the saliva. It's what's in the saliva.