@Berserker7205 personal I would attempt to use Vanilla, Coco, chocolate & coffee sented strains combined to fulfill that Hershey’s taste/smell. Same basic primary flavors for making vape juice.
So I’d first look through my list of choclate strains and pick out the ones that have any of these sent/tast profiles and start with that…
Alternatively Peanut butter strain X Chocolate would also work well, of course it might smell a little more like Nutella 
I’m not trying to tell ya what to do lol Just what I would do is all. I’m sure you have your own thoughts on how to accomplish your desired goal 