Prevalence of non-khamr alcohol in flavors

Assalamu `alaykum,

I would appreciate if someone can clarify about the prevalence of non-khamr alcohol in natural and artificial flavors. Is there a need to investigate whether the alcohol that is present in food items is from grapes or dates? Or is present industry practice such that only non-khamr alcohol is used in these food items.

Jazakallahu khairan