The original movie, Casablanca, starred Humphrey Bogart and Lauren Bacall, not Will Smith. (He wasn't even alive at the time).
Now, as to whether or not Will Smith has visited the city of Casablanca, Morocco, this is an entirely separate question.
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Zane Casablanca goes by Big Z.
Did Drew Barrymore attend John Casablanca Agency?
The cast of Shoeshine Boy of Casablanca - 2010 includes: Reda M
It's in Africa the country of Morroco.
Karim Mounir was born in Casablanca, in Morocco.