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Inside a Colorado marijuana factory

20 February 2014 Last updated at 00:15 GMT

Colorado became the first US state to allow firms to sell recreational cannabis on 1 January.

Since then, Medicine Man in Denver, Colorado has been doing a steady stream of business.

They've recently outgrown their 20,000 sq ft facility and have plans to double their size this year.

Elan Nelson gave the BBC a tour of the facility.