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Once you pass through airport security you can only use your dirhams to spend on food in the cafes.
All the other shops including the duty free shops are NOT allowed to accept dirhams and only accept hard currency such as euros.

If you did have excess dirhams you can change these in the airport before you go through security.

Especially when the cigarettes are so cheap in the duty free shops, you'd be kicking yourself if all you have is dirhams to spend.]]> http://www.ivebeenthere.co.uk/tips/19960