Estimated impact of the Stop Smoking Services (SSS) on the reduction in smoking prevalence in England: 2001–2016
| Year | Percentage point reduction in smoking prevalence | Annual percentage point reduction in smoking prevalence | Average proportion of SSS supported quitters | Annual prevalence reduction attributable to SSS |
| 2001– 2012 | 8.0% (from 28.6% in 2001 to 20.6% in 2012) | 0.727% | 15.68% | 0.114% |
| 2012– 2016 | 2.8% (from 20.6% in 2012 to 17.8% in 2016) | 0.700% | 14.03% | 0.098% |
| 2001– 2016 | 10.8% (from 28.6% in 2001 to 17.8% in 2016) | 0.720% | 15.26% | 0.110% |