I am still trying to play catch-up, of all the posts that got past me, by reading backward when time permits. I saw this one, and don't recall anyone responding to your plea.
Fireball is
not in my wheelhouse; but I have tasted it <shudder>. It is a thick, syrup-y, liqueur (I refuse to call it a whiskey), that is popular with the non-whiskey drinking crowd. Imagine taking a pound of cinnamon Red Hot candies, adding just enough water to be able to boil them down to a thick syrup, and then adding just enough cheap generic whisky to get 66 proof (33%) alcohol content. That is Fireball.
I get no other flavor notes... but again I am not a fan. I am also not big on strong cinnamon. So I will gladly bow to other opinions.
To formulate a vape, in
my mind, you need three things:
1. A
strong "hot" cinnamon note. This should be the core of the recipe. FW Red Hots may be a good candidate for this. I haven't used it; so I can't say. I would imagine either of the TFA Cinnamon Red Hots (original or "PG") would also work.
2. A significant amount of sweet. Use sweetener of your choosing. Be aware of potential muting by higher sweetener levels... may need to adjust other concentrates. This is the middle note of the recipe.
3. Last (and lightest), a light background whiskey note. Don't use any of your spendy whiskey concentrates here; as it is not supposed to be the star/focus. TFA-Kentucky Bourbon would probably be what I would try first. It is both inexpensive, and readily available. You only need enough to "suggest" this might be a whiskey(ish) drink.
4. And
maybe, if it still isn't quite "thick" enough (and I would save it as a last ditch effort), I might consider just a touch of meringue, or marshmallow.
I get no other notes of bakery, or brown sugar/molasses, or even vanilla. So, unless your Son-in-law is saying he tastes those (or any other) notes; I would leave them out. I think less is going to be more with this one.
One variation that might be interesting, is the use of a cooling agent, like WS-23 or koolada. The real beverage is most often served well chilled. (Bars, where it is popular, often store it in the freezer. I am guessing; due to the excessively sweet nature of it.) That might add a bit more "authenticity" to the vape. However, this is totally optional.
If, you get something that meets with his approval, I would love to know what it is. I am curious how close/distant I might be.