It's an age-old question. How does one singer become successful and another not? What separates someone good from someone great? Well, asked how she has achieved her distinctive tone, Duffy told The Mirror: "Smoke 40 cigarettes a day and you get a rough idea".
So, just to clarify, the best way to get a rich, bankable tone to your voice is to smoke two full packs of cigarettes a day. And the best thing is, it'll make you look cooler, too.