Well, puke-flavored chocolate seems to be doing alright. In the US, they have more butyric acid in it, an acid also found in vomit. To be precise the milk used in the production is treated(lipolysis) for longer shelf-life producing more of it. Hershey is accused of using a modified version of it which makes the taste to distinctive. If that wasn't bad enough, all the smaller brands in US are trying to imitate that taste, so... Glad I live in Europe.
https://www.mentalfloss.com/posts/why-american-chocolate-tastes-like-vomit