You should probably vape unflavored liquid. The chemicals you listed are flavorings.
2,3,5-Trimethylpyrazine: Common Applications caramel, chocolate, coffee, nut, corn, popcorn, potato
2-Acetyl Pyrazine: roasted, nutty, bready; corn chips (enhancer); graham cracker (enhancer)
Methyl cyclopentenolone hydrate: caramel, sweet, maple, licorice, nutty
Ethyl maltol: sweetener (cotton candy)
You may want to stop eating any processed foods as well, since when a label says "contains natural and artificial flavors" it's full of ingredients with scary sounding names. These aren't harmful "chemicals" they are the names of flavor and scent molecules that have been isolated. A bite of raw coconut doesn't taste very coconuty, but a Mounds Bar does. Why? Because a Mounds Bar has coconut flavoring in it. Coconut flavoring is Massoia Lactone, derived from the bark of the Massoia tree. Who knows why it tastes more like coconut than "real" coconut, but it does. Did you ever imagine that quitting smoking would involve learning about chemistry?
And while you explore the chemical names of common flavors, don't forget to drink lots of Dihydrogen Monoxide.