THS	Thirdhand smoke
SHS	Secondhand smoke
SSS	Mainstream smoke
DSB	Double-strand break
dGuo	2′-Deoxyguanosine
dCyt	2′-Deaxycytidine
IARC	International Agency for Research on Cancer
NTP	National Toxicology Program
HONO	Nitrous acid
TSNA	Tobacco-specific nitrosamine
NNA	1-(N-Methyl-N-nitrosamino)-1-(3-pyridinyl)-4-butanal
NNK	4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone
NNN	N′-Nitrosonornicotine
LA-qPCR	Long amplicon-qPCR
HPRT	Hypoxanthine-guanine phosphoribosyltransferase
POLB	DNA polymerase β
HPB	4-Hydroxy-1-(3-pyridyl)-1butanone
FACS	Fluorescence-activated cell sorting