In the Mexican city that once perfumed the world, a push to revive vanilla

"If you have bad thoughts, they disappear, if you're angry, it disappears, because the aroma has an effect of high relaxation," said Lucio Olmos Morales, a local artisan.

The Spanish colonizers eventually took Mexico's vanilla to Europe, where it was consumed by the aristocracy and fed a growing craving for the spice.

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