Question: Where does the smell of vanilla come from?
Disambiguated questions and answers: question: From what source does vanilla and the smell of vanilla come from?
What part of the vanilla plant does the smell of vanilla come from?
What chemicals gives vanilla the smell of vanilla?
answer: orchids of the genus Vanilla
The fruit, a seed capsule, if left on the plant
phenolic compounds
Natural Questions answer: as it dries
phenolic compounds crystallize (from the Wikipedia article "Vanilla")