Depends on how you define smart. Of course they do have a reptilian brain and follow the restrictions of this.
So they will never feel befriended to their owner, play or love handling.
But still they have some amazing abilities. Above all, they learn to know each other personally and devlop a stron pair bond. If a female of a bonded pair dies, the male searxches and calls endlessly for her. Even if a nice replacemtn female is made available. Also they obviously remember "tokay faces" for a long time as I conclude from their behaviour after withdrawal of cagemates and reintroduction of the same sepcimen after several years.
Also they can learn to soem extent to differentiater between "known" and "unknown" humans independent from their respective clothing.
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