Licking habit

One of our Dachshunds, "Lady" (1 1/2 yrs old) , licks the upholstered furniture, my jeans pantleg, the carpet, and hands. I have tried putting a soft toy in front of her, and telling her to, "Stop!", to no avail. Her sister sibling, same age, licks the carpet, too --- what is the best way to discourage this habit?