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Based on limited metadata with no full letter text available, this warning letter was issued to The Zen Vaper E-Liquids, LLC on November 29, 2021, regarding tobacco products (specifically e-liquids/vaping products). While the specific violations cannot be determined from the available metadata, the warning likely pertains to FDA regulatory requirements for tobacco product manufacturing, marketing, or reporting. The letter was issued by the FDA's tobacco regulatory division, though the specific issuing office is not specified in the metadata provided.