With a very few exceptions (tobacco esp.), I think one key to whether a flavor will actually work or not is simply whether you'd want a beverage with that flavor/density etc. , in a juice, soda or milkshake. People like the french toast (from elsewhere) for the maple and cinnamon I think - the other flavors that are basically not desert/beverage get only novelty reviews, and mixed. Vape is more like sipping than snacking on, um, *fried potatoes and onions?*. But that's a fun thought.
The bakery flavors work because they could also make a nice milkshake. Candy flavors would work as a soda. And all of the fruits are drinkable. Coffee, tea, CHAI (great idea). Am I wrong in that?
Main thing for me is no floral perfumery. That or weak or medicinal flavors are the killer for me.