U don't vape oils for that reason ur vaping the same thing as in fog machines. They rnt harmless but they rnt even close to half as deadly as cigs either. Vaping has had alot of fear mongering around it such as popcorn lung. which has never occurred from vaping only extreme oral ingestion or inhalation of the actual powdered flavouring component has caused that, i feel sure enough abt this to add the ingredient to selfmade eliquids. The oils ur referring to are most likely vitamin e acetate and mct both cause oil build up in lungs when vaped, that's not disputed, but they haven't been used in commercial eliquids for years.

Edit: I forgot to add that so far the worst I've found w vaping is an increased risk for copd but fsr less than cigarettes and itll only raise if we force vapers onto the black market with unregulated eliquid, it also seems to correspond to nicotine level. My source is I researched eliquid components harm fairly indepthly to choose the best ingredients for my own liquid.