All links accessed September 1 2017

1. Department of Health. 'Towards a Smoke-free Generation - A Tobacco Control Plan for England'. July 18 2017 - https://www.gov.uk/government/publications/towards-a-smoke-free-generation-tobacco-control-plan-for-england

2. Public Health England. Guidance: 'Smoking and tobacco: applying All Our Health'. Updated  August 4 2017 - https://www.gov.uk/government/publications/smoking-and-tobacco-applying-all-our-health/smoking-and-tobacco-applying-all-our-health

3. NHS Digital. 'Statistics on NHS Stop Smoking Services: England, April 2016 to March 2017'. Published August 17 2017 - http://www.digital.nhs.uk/catalogue/PUB30058

4. ASH Action on Smoking and Health. Press release. 'New Government data shows valuable Stop Smoking Services continue to decline'. August 18 2017 - http://ash.org.uk/media-and-news/press-releases-media-and-news/new-government-data-shows-valuable-stop-smoking-services-continue-to-decline/

5. BMJ Newsroom. 'Rise in e-cigarettes linked to rise in smokers quitting, say researchers'. July 27 2017 - http://www.bmj.com/company/newsroom/rise-in-e-cigarettes-linked-to-rise-in-smokers-quitting-say-researchers/

6. NCSCT National Centre for Smoking Cessation and Training. Frequently asked questions. http://www.ncsct.co.uk/publication_frequently-asked-questions.php

7. NHS Digital. 'Statistics on Smoking, England - 2017 [NS]'. Published June 15 2017 - http://www.content.digital.nhs.uk/catalogue/PUB24228

8. Scottish Government. The Scottish Health Survey 2015: Volume 1: Main Report. Published September 20 2016 - http://www.gov.scot/Publications/2016/09/2764/0

9. British Heart Foundation Press Office. 'BHF responds to the government's new Tobacco Control Plan'. July 18 2017 -  https://www.bhf.org.uk/news-from-the-bhf/news-archive/2017/july/bhf-responds-to-the-governments-new-tobacco-control-plan

10. ASH Fact sheets. 'Smoking and disease'. Last reviewed June 2017 - http://ash.org.uk/category/information-and-resources/fact-sheets/

11. https://academic.oup.com/ntr/article-abstract/doi/10.1093/ntr/ntx166/4096490/The-Relationship-of-E-Cigarette-Use-to-Cigarette

12. DT Levy et al. 'The Relationship of E-Cigarette Use to Cigarette Quit Attempts and Cessation: Insights From a Large, Nationally Representative U.S. Survey'. Nicotine & Tobacco Research. ntx166. Published online August 31 2017 -  https://academic.oup.com/ntr/article-abstract/doi/10.1093/ntr/ntx166/4096490/The-Relationship-of-E-Cigarette-Use-to-Cigarette

13. Royal Pharmaceutical Society. 'Medicines, Ethics and Practice' Edition 41. Sect 3.5.12 electronic cigarettes. July 2017.

14. General Pharmaceutical Council. 'GPhC outlines position on sale of e-cigarettes in registered pharmacies'. February 19 2014 - https://www.pharmacyregulation.org/gphc-outlines-position-sale-e-cigarettes-registered-pharmacies

15. GPhC. Regulate. 'Complying with new legislation prohibiting sales of e-cigarettes to under 18s'. August 17 2016 -  https://www.pharmacyregulation.org/regulate/article/complying-new-legislation-prohibiting-sales-e-cigarettes-under-18s

16. Royal College of Physicians. 'Nicotine without smoke - Tobacco harm reduction. A report by the Tobacco Advisory Group of the Royal College of Physicians'. April 2016 - https://www.rcplondon.ac.uk/projects/outputs/nicotine-without-smoke-tobacco-harm-reduction-0

17. NCSCT. 'Electronic cigarettes: A briefing for stop smoking services'. January 2016. - http://www.ncsct.co.uk/usr/pub/Electronic_cigarettes._A_briefing_for_stop_smoking_services.pdf