Are you familiar with propylene glycol? Also known as PG, this substance has been used by a variety of industries since the 1950s as an additive in different products. PG plays a role in the e-liquid of a Geek Bar Pulse vape device, food, and even theatrical fog machines! Now, the real question is – what does propylene glycol actually do?Here you’ll read about the advantages and disadvantages of PG to help you make informed choices with vaping. You’ll learn what propylene glycol is, its applications, and potential health risks. You’ll also go through the differences between propylene glycol and vegetable glycerin.