3 Bottles of E-Liquid

What is acetyl propionyl?

It’s an alternative flavouring - in place of the potentially-harmful diacetyl - which looks to create the rich, buttery taste that makes up some e-liquids. Unfortunately, it has been discovered just recently that acetyl propionyl and acetoin (another alternative) can catalyse into trace diacetyl.

This catalyzation can happen during manufacturing or even while vaping. Accordingly, many vapers aim to avoid these ingredients. While there is no scientific evidence to suggest these are truly harmful, many suggest erring on the side of caution until the testing has been carried out.