I'd be impressed if Duke manages any defense whatsoever against NC State's backcourt. It's not just Smith. The other guy, Terry Henderson, is really good on offense, too. Bombs away from 3 and avoids midrange (64% of his shots are from 3, 19% are from midrange, 18% are at the rim). While he doesn't get a lot of layups, he still draws a decent amount of fouls (38% FT rate). He's a good enough shooter with this shot selection (38% 3pt, 70% FT) to be NC State's most efficient scorer, though Smith is obviously doing the heavy lifting to get Henderson open looks.
NC State's defense is how they lose so much. If Capel can come up with something to slow down Smith and Henderson, it will just be a bonus on top of hopefully putting up close to 100 points and outscoring them.