Not that I have ever heard of. There may be some tables or slot areas designated as non-smoking, but I have never heard of of a casino that was smoke-free.
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Darlene Mariner of the Seas Carnival Magic Bloggers Cruise 5 Mariner of the Seas
HAL Statendam Alaska Cruise Tour - 09/09/12; Disney Magic - 12/01/12; Allure of the Seas - 05/26/13