What exactly is E-liquid?

E-liquid is the flavored fluid with or without nicotine that is heated and inhaled by the vaper using an electronic device. Most E-liquids are very similar in terms of ingredients, with main difference in PG/VG ratio, although there are a wide number of different flavors available. E Liquids are produced from vegetable glycerin (VG), propylene glycol (PG), variety of flavorings and nicotine.