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Based on limited metadata, this warning letter was issued to KingPin Cigarettes, Inc., operating as Blackhat Vapor Company, a tobacco product manufacturer, on November 26, 2019. Without access to the full letter text or subject line details, the specific nature of the violations cannot be determined from the available information. The FDA issued this warning through an unknown office within its tobacco regulatory structure. To understand the precise compliance issues and required corrective actions, the complete warning letter would need to be reviewed.