Smith looks to be slotted at #2 right now... under Rodgers, of course. I'm seen him as #1 on a lot of boards, though.
Most of the mocks I have seen have him slotted at #3 pick, for the Browns.
It would be great for the Browns to get such a great franchise QB to build around, but number three seems kind of high. It is possible that the QB needy teams like Cleveland or maybe Arizona will trade down to get Smith.