
Keywords: DIW; deionized water; Gua; guanine; LC-MS/MS; liquid chromatography-tandem-mass spectrometry; LODs; limits of detection; MRM; multiple reaction monitoring; MS; mainstream smoke; N3-EtAde; N3-ethyladenine; N3-MeAde; N3-methyladenine; N7-EtGua; N7-ethylgu