EC	Electronic Cigarette
HPHC	Harmful and Potentially Harmful Compounds
CO	Carbon Monoxide
ROS	Reactive Oxygen Species
CORESTA	Cooperation Centre for Scientific Research Relative to Tobacco
CORESTA-like	Minor modifications of CORESTA protocols
MTL	Mouth to Lung
DTL	Direct to Lung
MEV	Mass of E-liquid Vaporized
PG	Propylene glycol
VG	Vegetable glycerine (glycerol)
DNPH	2,4-dinitrophenyl hydrazine (2,4-DNPH)
LC	Liquid Chromatography
GC	Gas Chromatography
MS	Mass Spectrometry
HP	High Performance
HR	High Resolution
UV	Ultraviolet
EPR	Electron Paramagnetic Resonance
NMR	Nuclear Magnetic Resonance
ICP	Inductively Coupled Plasma
C	degrees centigrades
pg	picogram
ng	nanogram
$\mathsf{\mu }$g	microgram
g	gram
mg	milligram
mL	milliliter
L	Litter
cm	centimeter
m	meter
s	secondsr
min	minutes
h	hour
W	watts
V	Volts
$\mathrm{\Omega }$	ohms