CCL20	C-C motif chemokine ligand 20
CCL12	C-C motif chemokine ligand 12
CCL5	C-C motif chemokine ligand 5
CSC	Cigarette smoke condensate
CX3CL1	C-X3-C motif chemokine ligand I
ECC	E-cigarette smoke condensate
EC	Electronic cigarette, e-cigarette
ENDS	Electronic nicotine delivery system
EU	European Union
EVALI	E-vaping-associated lung injury
FDA	Food and Drug Administration
GIT	Gastrointestinal tract
HFD	High-fat diet
HNSCC	Head and neck squamous cell carcinoma
HGF	Human gingival fibroblast
LFT	Liver function test
IFN-ɣ	Interferon gamma
IL-10	Interleukin-10
MMP	Matrix metalloproteinase
NC	Nicotine-containing
NF	Nicotine-free
NFEC	Nicotine-free e-cigarette
SCC	Squamous cell carcinoma
OSCC	Oral squamous cell carcinoma
PG	Propylene glycol
VG	Vegetable glycerine