1 tablespoon olive oil
3 medium leeks, white and light green parts only, rinsed and sliced (about 3 cups)
1 garlic clove, minced
1 large russet potato, peeled and cubed
1 large stalk celery, chopped
1/2 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
2 cups vegetable broth
2 tablespoons tomato paste
2 cups milk (any fat content)
8 ounces smoked salmon, flaked
1/2 cup heavy cream
2 tablespoons chives, chopped