By Emma Rumney

LONDON (Reuters) -The U.S. Postal Service has cracked down on distributors of unregulated vapes using its services for business shipments, letters reviewed by Reuters show, in a blow to a multi-billion dollar industry that has dented Big Tobacco's sales.

The letters, previously unreported, show that USPS wrote to major New York-based distributor Demand Vape, blocking it from using its services after New York City's Law Department, which represents the city's government and officials in legal matters, provided evidence that its shipments broke laws.

USPS' action stands to benefit tobacco giants including Altria and British American Tobacco, which have for years battled against unregulated vapes, mostly from China.

Unregulated vapes lack the authorisation from the U.S. Foo

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