Employees help customers at the crowded sales counter inside Medicine Man marijuana retail store, which opened as a legal recreational retail outlet in Denver on Wednesday Jan. 1,
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Cannabis goes on legal sale in US state of Colorado

1 January 2014 Last updated at 23:13 GMT

The US state of Colorado has become the first to allow stores to legally sell cannabis.

Shop owners had stocked up, prepared celebrations and hired extra security in preparation for their opening on 1 January, dubbed Green Wednesday.

Critics say it sends the wrong message to the nation's youth and fear it will lead to serious public health and social problems.

Nada Tawfik reports.