Propylene Glycol, also referred to as “PG”, is much thinner than vegetable glycerin. Its consistency is comparable to water. It wicks nicer and provides you with a stronger throat hit. PG tends to give you a genuine discernment of the flavors you are adding to your mixture.
Vegetable Glycerin, also referred to as “VG”, is very thick compared to water and propylene glycol. It has a slightly sweeter taste, and will provide more “cloud” than PG.