8-OH-dG, 8-hydroxy-deoxyguanosine; CARBS, protein carbonyls; CO, carbon monoxide; DCF-DA, 2',7'-dichlorodihydrofluorescein diacetate; DMEM, Dulbecco's modified Eagle's medium; DNPH, 2,4-dinitrophenylhydrazine; DPPH, 2,2-diphenyl-1-picrylhydrazyl; DPPHH, 2,2-diphenyl-1-picrylhydrazine; E-cigarettes; E-liquids; ENDS, electronic nicotine delivery systems; EPR, electronic paramagnetic resonance; Endothelial cells; FSC, forward light scattering; GSH; GSH, reduced form of glutathione; HCL, hydrochloric acid; HCN, hydrogen cyanide; MDA, malondialdehyde; Oxidative stress; PBS, phosphate buffered saline; PG, propylene glycol; ROS; ROS, reactive oxygen species; SSC, side light scattering; TAC, total antioxidant capacity; TBA, thiobarbituric acid; TBARS, thiobarbituric acid reactive substances; TCA, trichloroacetic acid; Tris-HCl, trishydroxymethylaminomethane hydrochloride; VG, vegetable glycerin