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
MTL	Mouth to Lung
DTL	Direct to Lung
TPD	Tobacco Product Directive
MEV	Mass of E-liquid Vaporized
PDE-ICH	Permissible Daily Exposure (International Council for Harmonization of
	Technical Requirements for Pharmaceuticals for Human Use)
MRL-ATSDR	Minimal Risk Level (Agency for Toxic Substances Disease Registry)
PEL-NIOSH	Permissible Exposure Level (National Institute of Occupational Safety and Health)
PEL-OSHA	Permissible Exposure Level (Occupational Safety and Health Agency)
NOAEL	No Observed Adverse Effect Level
PG	Propylene glycol
VG	Vegetable glycerine (glycerol)
ICP-MS	Inductively Coupled Plasma Mass Spectroscopy
ICP-OES	Induced Coupled Plasma Optical Emissions Spectroscopy
FDA	Food and Drug Agency,
PMTA	Pre-Market Tobacco Autorization
BLOD	Below Detection Limit
BLOQ	Below Quantification Limit
NDFB	Not Different From Blanks
EMA	European Medicine Agency
ADA	American Dentist Association
pg	picogram
ng	nanogram
$\mathsf{\mu }$g	microgram
mg	milligram
g	gram
mL	milliliter
L	Litter
cm	centimeter
m	meter
h	hour
min	minute
s	second
$\mathsf{\Omega }$	Ohm
W	Watt
V	Volt
kPa	kilopascal