Underpinning evidence for the estimate that e-cigarette use is around 95% safer than smoking:
https://drive.google.com/file/d/0B1vrZjMCDodCanUtYmJHci1kbE9wMVdlVEswcGpZTXFMTkJR/view
E-cigarettes around 95% less harmful than tobacco estimates landmark review
https://www.gov.uk/government/news/e-cigarettes-around-95-less-harmful-than-tobacco-estimates-landmark-review
Vaping in England: an evidence update February 2019
https://assets.publishing.service.gov.uk
Royal College of Physicians Study Report
https://www.rcplondon.ac.uk/projects/outputs/nicotine-without-smoke-tobacco-harm-reduction
Action on Smoking and Health UK Factsheet on E-Cigarettes
https://drive.google.com/file/d/0B1vrZjMCDodCN2pqdkZSZDFUb2s/view
Cancer Research UK Briefing: Electronic Cigarettes
https://www.cancerresearchuk.org/sites/default/files/e-cigarette_briefing_july_2018_final.pdf?utm_source=t.co&utm_medium=referral
Effectiveness and tolerability of electronic cigarette in real-life: a 24-month prospective observational study
https://link.springer.com/article/10.1007/s11739-013-0977-z
Suitability of biomarkers of biological effects (BOBEs) for assessing the likelihood of reducing the tobacco related disease risk by new and innovative tobacco products: A literature review
https://www.sciencedirect.com/science/article/abs/pii/S0273230018300473
Effects of switching to electronic cigarettes with and without concurrent smoking on exposure to nicotine, carbon monoxide, and acrolein
https://cancerpreventionresearch.aacrjournals.org/content/8/9/873
E-cigarette safety
https://www.cancerresearchuk.org/health-professional/awareness-and-prevention/e-cigarette-hub-information-for-health-professionals/safety
Second-hand aerosol from tobacco and electronic cigarettes: Evaluation of the smoker emission rates and doses and lung cancer risk of passive smokers and vapers
https://www.sciencedirect.com/science/article/abs/pii/S0048969718321302
Nicotine, carcinogen, and toxicant exposure in long- term e- cigarette and nicotine replacement therapy users: a cross- sectional study
https://www.acpjournals.org/doi/10.7326/M16-1107
The Health Effects of Snus
http://snuskommissionen.se/wp-content/uploads/2016/05/Snusets_halsoeffekter_A5_eng.pdf
Tobacco harm reduction: what do the experts think?
https://tobaccocontrol.bmj.com/content/13/2/123
Snus saves lives
http://snuskommissionen.se/wp-content/uploads/2017/06/Snuskommissionen_rapport3_eng_PRINT.pdf
Global State of Tobacco Harm Reduction Briefing Paper 2020
https://gsthr.org/report/2020-briefing-paper
The Global State of Tobacco Harm Reduction (GSTHR)
Evaluation of Toxicant and Carcinogen Metabolites in the Urine of E-Cigarette Users Versus Cigarette Smokers
https://academic.oup.com/ntr/article-abstract/17/6/704/1043695
Exposure to Nicotine and Selected Toxicants in Cigarette Smokers Who Switched to Electronic Cigarettes: A Longitudinal Within-Subjects Observational Study
https://academic.oup.com/ntr/article-abstract/19/2/160/2631650
Comparing the cancer potencies of emissions from vaporized nicotine products including e-cigarettes with those of tobacco smoke
https://tobaccocontrol.bmj.com/content/27/1/10
Comparison of Nicotine and Toxicant Exposure in Users of Electronic Cigarettes and Combustible Cigarettes
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2718096