This is a rich and satisfying supper with wonderful flavors.
In a large pot of boiling salted water, cook pasta according to package instructions. Meanwhile, in a small saucepan, melt butter over medium. Add shallot; season with salt and pepper. Cook until soft, about 5 minutes. Add wine and cook until evaporated, about 5 minutes. Add cream; bring to a boil. Reserve 1/2 cup pasta water; drain pasta and return to pot. Add cream mixture to pasta pot, along with lemon juice, smoked salmon, and chives. If necessary, adjust consistency with reserved pasta water and season with salt and pepper.
Taste this dish before adding more salt, as some smoked salmon can be very salty.