1. Office for National Statistics.Adult smoking habits in the UK:2017. Available at:https://www.ons.gov.uk/releases/adultsmokinghabitsintheuk2017(accessed 22 March 2019).
2. WestR. BrownJ.Smoking in England: latest statistics. Available at:http://www.smokinginengland.info/latest‐statistics/(accessed 3 February 2019)
3. WestR.Stop Smoking Services: Increased Chances of Quitting. London: National Centre for Smoking Cessation and Training;2012. Available at:http://www.ncsct.co.uk/publication_Stop_smoking_services_impact_on_quitting.php(accessed 29 January 2019).
4. Performance of English stop smoking services in first 10 years: analysis of service monitoring data
5. NHS Digital.Statistics on NHS Stop Smoking Services in England—April 2017 to March 2018. Available at:https://digital.nhs.uk/data‐and‐information/publications/statistical/statistics‐on‐nhs‐stop‐smoking‐services‐in‐england/april‐2017‐to‐march‐2018(accessed 22 January 2019).