In general, e-cigarettes often contain ingredients such as propylene glycol (PG) and glycerol, mixed with concentrated flavors and, optionally, a variable percentage of nicotine. Quantitative and qualitative studies have identified a wide variety of chemical components in the cartridges, refill solutions, and aerosols of e-cigarettes. Herrington and Myers (2015) have detected approximately 60 to 70 compounds (unidentified and identified) in each liquid tested, only varying by several constitu...
