Smoking cessation services in England have trebled their impact in helping smokers to give up over the past decade, a study has found. However, a wide variation across local services was noted. The researchers analysed the performance of stop smoking services across England from 2001/02 to 2010/11, asking the questions: How has the performance of the services changed? How well have the services met the needs of different groups including economically disadvantaged smokers? How much local variation has there been in success rates?