BER	Base Excision Repair Mechanisms
BOP	Bleeding on Probing
e-cigs	Electronic Cigarettes
e-liquid	E-cig Liquid
ENDS	Electronic Nicotine Delivery Systems
GCF	Gingival Crevicular Fluid
HGF	Human Gingival Fibroblasts
HnB	Heat not Burn
NNN	N’-nitrosonornicotine
OMLs	Oral Mucosal Lesions
OSCC	Oral Squamous Cell Carcinoma
ROS	Reactive Oxygen Species