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Lead researcher Dr Nicola Lindson-Hawley, from Oxford University, said: "The difference in quit attempts seemed to arise because people struggled to cut down

Walls, ceilings, and floors are often the main areas that retain smoke smells

Initially, Silk Cut used a tobacco substitute called Cytrel

It can cover the colour, but it cant block the smoke particles sitting underneath the surface

Mildew usually has a mild, musty smell, while mold smells can be stronger and more pungent

The company said there would be an impact from the fall in sterling against the dollar and that trading remained "challenging" in a number of key markets