No one is dying from eliquid flavouring, as mentioned above people are dying from dodgy THC juices.
That aside, it is “better” when you make your own juice, as you are the only one tampering with your end product. The flavourings they are food grade.
Yet, all in all is vaping healthy? No, it isn’t but, and for me this is the big but and I’m sure many can agree, it’s better than smoking and an easier way to get off completely from nicotine.
If you buy from reputable vendors, all the ingredients are of reputable source, that being said with all the regulations all the additives have to be indicated.
So unlike cigarettes, all the ingredients are labelled and as such it’s ones own decision whether to consume the product or not.