Cook the fettuccine or linguine according to package instructions in a large pot of salted boiling water until al dente. Drain and set aside, reserving 1/2 cup of the pasta cooking water.
In a large skillet, heat the olive oil over medium heat. Add the minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Pour in the heavy cream, lemon zest, and lemon juice. Stir to combine and bring to a gentle simmer.
Add the cooked pasta to the skillet, along with the reserved pasta water, smoked salmon, and Parmesan cheese. Toss gently to combine, allowing the sauce to coat the pasta evenly.
Season with salt and pepper to taste. Cook for an additional 2-3 minutes until heated through.
Serve immediately, garnished with fresh dill or parsley.