Jackson, S. E., Kotz, D., West, R. & Brown, J. Moderators of real-world effectiveness of smoking cessation aids: A population study. Addiction 114, 1521–1720. https://doi.org/10.1111/add.14656 (2019).
Farsalinos, K. E. & Gillman, G. Carbonyl emissions in e-cigarette aerosol: A systematic review and methodological considerations. Front. Physiol. 8, 1119 (2018).
Hajek, P. et al. Nicotine delivery and users’ reactions to Juul compared with cigarettes and other e-cigarette products. Addiction https://doi.org/10.1111/add.14936 (2020).
Farsalinos, K. E. et al. Nicotine absorption from electronic cigarette use: Comparison between first and new-generation devices. Sci. Rep. 3, 1–7 (2014).
Hajek, P. et al. A randomized trial of e-cigarettes versus nicotine-replacement therapy. N. Engl. J. Med. 380, 629–637 (2019).
Hitchman, S. C., Brose, L. S., Brown, J., Robson, D. & McNeill, A. Associations between e-cigarette type, frequency of use, and quitting smoking: Findings from a longitudinal online panel survey in Great Britain. Nicotine Tob. Res. 17, 1187–1194 (2015).
Hartmann-Boyce, J. et al. Electronic cigarettes for smoking cessation. Cochrane Database Syst. Rev. https://doi.org/10.1002/14651858.CD010216.pub4 (2020).
Shahab, L. et al. Nicotine, carcinogen, and toxin exposure in long-term e-cigarette and nicotine replacement therapy users. Ann. Intern. Med. 166, 390 (2017).
Stratton, K., Kwan, L. & Eaton, D. Public Health Consequences of e-Cigarettes. National Academies of Sciences, Engineering, and Medicine (National Academies of Sciences (US), 2018). https://doi.org/10.17226/24952.
Gravely, S. et al. Prevalence of awareness, ever-use and current use of nicotine vaping products (NVPs) among adult current smokers and ex-smokers in 14 countries with differing regulations on sales and marketing of NVPs: Cross-sectional findings from the ITC Project. Addiction 114, 1060–1073 (2019).
McNeill, A., Brose, L. S., Calder, R., Bauld, L. & Robson, D. Vaping in England: 2020 evidence update summary. Report commissioned by Public Health England (2020).
Walker, N. et al. Nicotine patches used in combination with e-cigarettes (with and without nicotine) for smoking cessation: a pragmatic, randomised trial. Lancet Respir. Med. 8, 54–64 (2020).
Beard, E., West, R., Michie, S. & Brown, J. Association of prevalence of electronic cigarette use with smoking cessation and cigarette consumption in England: A time–series analysis between 2007 and 2017. Addiction https://doi.org/10.1111/add.14851 (2019).
Wagener, T. L. et al. Have combustible cigarettes met their match? The nicotine delivery profiles and harmful constituent exposures of second-generation and third-generation electronic cigarette users. Tob. Control 26, e23–e28 (2017).
Farsalinos, K. E., Voudris, V., Spyrou, A. & Poulas, K. e-Cigarettes emit very high formaldehyde levels only in conditions that are aversive to users: A replication study under verified realistic use conditions. Food Chem. Toxicol. 109, 90–94 (2017).
Jackler, R. K. & Ramamurthi, D. Nicotine arms race: JUUL and the high-nicotine product market. Tob. Control 28, 623–628 (2019).
Talih, S. et al. Characteristics and toxicant emissions of JUUL electronic cigarettes. Tob. Control 28, 678–680 (2019).
Huang, J. et al. Vaping versus JUULing: How the extraordinary growth and marketing of JUUL transformed the US retail e-cigarette market. Tob. Control 28, 146–151 (2019).
Caldwell, B., Sumner, W. & Crane, J. A systematic review of nicotine by inhalation: Is there a role for the inhaled route?. Nicotine Tob. Res. 14, 1127–1139 (2012).
O’Connell, G. et al. A randomised, open-label, cross-over clinical study to evaluate the pharmacokinetic profiles of cigarettes and e-cigarettes with nicotine salt formulations in US adult smokers. Intern. Emerg. Med. 14, 853–861 (2019).
Fast-growing e-cigarette maker Juul to launch in UK. Reuters https://www.reuters.com/article/us-juul-britain/fast-growing-e-cigarette-maker-juul-to-launch-in-uk-idUSKBN1K62WC (2018).
Dawkins, L. et al. ‘Real-world’ compensatory behaviour with low nicotine concentration e-liquid: Subjective effects and nicotine, acrolein and formaldehyde exposure. Addiction 113, 1874–1882 (2018).
Kośmider, L., Kimber, C. F., Kurek, J., Corcoran, O. & Dawkins, L. E. Compensatory puffing with lower nicotine concentration e-liquids increases carbonyl exposure in e-cigarette aerosols. Nicotine Tob. Res. 20, 998–1003 (2018).
World Health Organisation. Heated Tobacco Products (HTPs) Market Monitoring Information (World Health Organization, 2018).
Simonavicius, E., McNeill, A., Shahab, L. & Brose, L. S. Heat-not-burn tobacco products: A systematic literature review. Tob. Control 28, 582–594 (2018).
McNeill, A., Brose, L. S., Calder, R., Bauld, L. & Robson, D. Evidence review of e-cigarettes and heated tobacco products 2018. Report commissioned by Public Health England (2018).
Poynton, S. et al. A novel hybrid tobacco product that delivers a tobacco flavour note with vapour aerosol (Part 1): Product operation and preliminary aerosol chemistry assessment. Food Chem. Toxicol. 106, 522–532 (2017).
Jackson, S. E., Farrow, E., Brown, J. & Shahab, L. Is dual use of nicotine products and cigarettes associated with smoking reduction and cessation behaviours? A prospective study in England. BMJ Open 10, e036055 (2020).
Glasser, A., Abudayyeh, H., Cantrell, J. & Niaura, R. Patterns of e-cigarette use among youth and young adults: Review of the impact of e-cigarettes on cigarette smoking. Nicotine Tob. Res. 21, 1320–1330 (2019).
Mantey, D. S., Cooper, M. R., Loukas, A. & Perry, C. L. e-Cigarette use and cigarette smoking cessation among Texas college students. Am. J. Health Behav. 41, 750–759 (2017).
Kalkhoran, S., Chang, Y. & Rigotti, N. A. Electronic cigarette use and cigarette abstinence over 2 years among US smokers in the population assessment of tobacco and health study. Nicotine Tob. Res. 22, 728–733 (2020).
Use of e-cigarettes (vaporisers) among adults in Great Britain. Report by Action on Smoking and Health. https://ash.org.uk/information-and-resources/fact-sheets/statistical/use-of-e-cigarettes-among-adults-in-great-britain-2020/ (2020).
Fidler, J. A. et al. ‘The smoking toolkit study’: A national study of smoking and smoking cessation in England. BMC Public Health 11, 479 (2011).
Fidler, J. A., Shahab, L. & West, R. Strength of urges to smoke as a measure of severity of cigarette dependence: Comparison with the Fagerström Test for Nicotine Dependence and its components. Addiction 106, 631–638 (2011).
Jackson, S. E. et al. Comparison of trends in self-reported cigarette consumption and sales in England, 2011 to 2018. JAMA Netw. open 2, e1910161 (2019).
UK Health Research Authority. Policies, standards and regulations: Research involving children. https://www.hra.nhs.uk/planning-and-improving-research/policies-standards-legislation/research-involving-children/ (2018).
Social Grade in National Readership Survey. http://www.nrs.co.uk/nrs-print/lifestyle-and-classification-data/social-grade/ (2019).
R Development Core Team. R: A language and environment for statistical computing. R Found. Stat. Comput. https://doi.org/10.1007/978-3-540-74686-7 (2011).
Hoffman, M. D. & Gelman, A. The No-U-Turn sampler: Adaptively setting path lengths in Hamiltonian Monte Carlo. J. Mach. Learn. Res. 15, 1593–1623 (2014).
Lemoine, N. P. Moving beyond noninformative priors: Why and how to choose weakly informative priors in Bayesian analyses. Oikos 128, 912–928 (2019).
McElreath, R. Statistical rethinking: A Bayesian course with examples in R and Stan (Routledge, 2019).
Patel, M. et al. JUUL use and reasons for initiation among adult tobacco users. Tob. Control 28, 681–684 (2019).
Hammond, D. et al. Prevalence of vaping and smoking among adolescents in Canada, England, and the United States: Repeat national cross sectional surveys. BMJ 365, I2219 (2019).
Kyriakos, C. N. et al. Characteristics and correlates of electronic cigarette product attributes and undesirable events during e-cigarette use in six countries of the EUREST-PLUS ITC Europe Surveys. Tob. Induc. Dis. https://doi.org/10.18332/tid/93545 (2018).
Mallock, N. et al. Trendy e-cigarettes enter Europe: Chemical characterization of JUUL pods and its aerosols. Arch. Toxicol. 94, 1985–1994 (2020).
Hori, A., Tabuchi, T. & Kunugita, N. Rapid increase in heated tobacco product (HTP) use from 2015 to 2019: From the Japan ‘Society and New Tobacco’ Internet Survey (JASTIS). Tob. Control. https://doi.org/10.1136/tobaccocontrol-2020-055652 (2020).
Tabuchi, T. et al. Heat-not-burn tobacco product use in Japan: Its prevalence, predictors and perceived symptoms from exposure to secondhand heat-not-burn tobacco aerosol. Tob. Control 27, e25–e33 (2017).
Delnevo, C., Giovenco, D. P. & Hrywna, M. Rapid proliferation of illegal pod-mod disposable e-cigarettes. Tob. Control 29, e150–e151 (2020).
Hahn, S. National Survey Shows Encouraging Decline in Overall Youth E-Cigarette Use, Concerning Uptick in Use of Disposable Products. Press release by the U.S. Food and Drug Administration. https://www.fda.gov/news-events/press-announcements/national-survey-shows-encouraging-decline-overall-youth-e-cigarette-use-concerning-uptick-use (2020).
European Parliament and the Council of the European Union. Directive 2014/40/EU of the European Parliament and the Council. Off. J. Eur. Union L127, 1–38 (2014).
Romberg, A. R. et al. Patterns of nicotine concentrations in electronic cigarettes sold in the United States, 2013–2018. Drug Alcohol Depend. 203, 1–7 (2019).
Smets, J., Baeyens, F., Chaumont, M., Adriaens, K. & Van Gucht, D. When less is more: Vaping low-nicotine vs. high-nicotine e-liquid is compensated by increased wattage and higher liquid consumption. Int. J. Environ. Res. Public Health 16, 723 (2019).
Chen, C., Zhuang, Y. L. & Zhu, S. H. e-Cigarette design preference and smoking cessation: a US population study. Am. J. Prev. Med. 51, 356–363 (2016).
Cheng, K.-W. et al. Costs of vaping: Evidence from ITC four country smoking and vaping survey. Tob. Control https://doi.org/10.1136/tobaccocontrol-2019-055344 (2020).
Tattan-Birch, H., Brown, J. & Jackson, S. E. ’Give ’em the vape, sell ‘em the pods’: Razor-and-blades methods of pod e-cigarette pricing. Tob. Control , https://doi.org/10.1136/tobaccocontrol-2020-056354 (2021).
Jackson, S. E., Brown, J. & Jarvis, M. J. Dependence on nicotine in US high school students in the context of changing patterns of tobacco product use. Addiction https://doi.org/10.1111/add.15403 (2021).
Turkkan, N. & Pham-Gia, T. Highest posterior density credible region and minimum area confidence region: The bivariate case. J. R. Stat. Soc. Ser. C Appl. Stat. 46, 131–140 (1997).
Hoekstra, R., Morey, R. D., Rouder, J. N. & Wagenmakers, E. J. Robust misinterpretation of confidence intervals. Psychon. Bull. Rev. 21, 1157–1164 (2014).