National Academies Press: OpenBook

Public Health Consequences of E-Cigarettes (2018)

Chapter: 6 Research Needs: E-Cigarette Devices, Constituents, and Exposures

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Suggested Citation:"6 Research Needs: E-Cigarette Devices, Constituents, and Exposures." National Academies of Sciences, Engineering, and Medicine. 2018. Public Health Consequences of E-Cigarettes. Washington, DC: The National Academies Press. doi: 10.17226/24952.
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Page 173
Suggested Citation:"6 Research Needs: E-Cigarette Devices, Constituents, and Exposures." National Academies of Sciences, Engineering, and Medicine. 2018. Public Health Consequences of E-Cigarettes. Washington, DC: The National Academies Press. doi: 10.17226/24952.
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Page 174
Suggested Citation:"6 Research Needs: E-Cigarette Devices, Constituents, and Exposures." National Academies of Sciences, Engineering, and Medicine. 2018. Public Health Consequences of E-Cigarettes. Washington, DC: The National Academies Press. doi: 10.17226/24952.
×
Page 175
Suggested Citation:"6 Research Needs: E-Cigarette Devices, Constituents, and Exposures." National Academies of Sciences, Engineering, and Medicine. 2018. Public Health Consequences of E-Cigarettes. Washington, DC: The National Academies Press. doi: 10.17226/24952.
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Page 176

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

6 Research Needs: E-Cigarette Devices, Constituents, and Exposures The committee was tasked to provide a list of research needs to inform the Food and Drug Administration (FDA) and e-cigarette regulation that will be prioritized with respect to: • Research to gather information of most importance for the regulation of e-cigarettes to protect the population health • Research that should be a priority for federal funding Given the relatively short time that e-cigarettes have been used, it is understandable that the evidence base regarding their effects is limited. There is a great need for more evidence, as other research groups have documented (Walton et al., 2015). Manufacturers will need to produce this research in a short amount of time if current statutory deadlines remain in place. Researchers from academia will also be involved directly (in contracts with manufacturers and in grants from government and others) in the generation of these data. Some types of research involve a long time horizon; other important and informative research requires much less time to conduct. One type of research does not substitute for the other; a complete portfolio of research is needed. The committee understands that, in any new field, researchers struggle to conduct optimal research due to limitations of knowledge. Also, researchers feel the urgency to study a new important question and adapt what they know, without complete adjustments in research design or methods sufficient to address the nuances of the problem. Finally, the rapidly changing nature of the devices has made comparisons among studies difficult. The committee identified many gaps in the literature during its review and identified dozens of specific research needs that are important for understanding the effects of e-cigarettes and for FDA regulatory action. The committee identified two overarching research needs: addressing gaps in substantive knowledge and improving research methods and quality. Specific items for consideration identified by the committee are noted for each of these and are not listed in any priority order. ADDRESSING GAPS IN SUBSTANTIVE KNOWLEDGE Recommendation 6-1: The committee recommends that FDA and other federal research sponsors and/or device manufacturers prioritize e-cigarette 6-1 PREPUBLICATION COPY: UNCORRECTED PROOFS

6-2 PUBLIC HEALTH CONSEQUENCES OF E-CIGARETTES research that addresses key gaps regarding knowledge about e-cigarette devices, constituents, and exposures. This might include rapid response funding opportunities. Specific items for consideration follow: • Study the effects of carrier solvents and additives, including flavor ingredients and device characteristics (including the type of coil and power), on aerosol generation, aerosol physical properties, and the chemical profile of e-cigarette emissions. • Study the stability of e-liquid ingredients when heated, identify potential byproducts of thermal degradation and of compounds that were not initially present in the e-liquid, and ascertain determinants of change in aerosol composition. • Study the impact of e-cigarette use in indoor air quality and biomarkers of secondhand e-cigarette exposure in scenarios and exposure surveys that are relevant for the populations exposed, including workers in vape shops and attending vaping conventions, and children, pregnant women, and patients with cardiorespiratory disease who live with adults who use e-cigarettes. • Conduct research that would inform product standards regarding ingredient purity, batteries and chargers, and priority and novel emissions. • Establish procedures to rapidly evaluate changes to products currently on the U.S. market, focusing on device designs, design evolution (initiated by both manufacturers and users) and the corresponding alteration of chemical substance release patterns. IMPROVE RESEARCH METHODS AND QUALITY Recommendation 6-2: The committee recommends that FDA and other federal research sponsors and/or device manufacturers prioritize research that improves the quality of e-cigarette research to better understand the devices, constituents, and exposures. This includes protocol and methods validation and development and use of appropriate study design, including the use of the appropriate control groups. Specific examples are given below. • Develop one or more standardized puffing protocols that are different from the standard puffing protocol for combustible tobacco cigarettes and reflect a range of how users use e-cigarettes in real-life settings, including extreme use. • Develop and validate methods to produce aerosols and to analyze target constituents in e-cigarettes; the standardized method should reflect not only the average puffing conditions observed among the users in real-life settings, but also intensive puffing behaviors. • Develop and validate a standardized method to measure particle size distribution and respiratory deposition of e-cigarette aerosols. • Develop analytical methods to test chemicals in e-cigarette liquids and aerosols with a focus on screening and identifying potentially toxic compounds, including study of the effects of power and temperature and other device characteristics that generate such compounds. PREPUBLICATION COPY: UNCORRECTED PROOFS

RESEARCH NEEDS: DEVICES, CONSTITUENTS, AND EXPOSURES 6-3 • Use exposure conditions and animal models that are relevant to real-life inhalation exposure in humans. • Evaluate potentially biologically relevant interactions between nicotine and other constituents, such as flavorings, in in vitro and in vivo bioassays. REFERENCE Walton, K. M., D. B. Abrams, W. C. Bailey, D. Clark, G. N. Connolly, M. V. Djordjevic, T. E. Eissenberg, M. C. Fiore, M. L. Goniewicz, L. Haverkos, S. S. Hecht, J. E. Henningfield, J. R. Hughes, C. A. Oncken, L. Postow, J. E. Rose, K. L. Wanke, L. Yang, and D. K. Hatsukami. 2015. NIH electronic cigarette workshop: Developing a research agenda. Nicotine & Tobacco Research 17(2):259-269. PREPUBLICATION COPY: UNCORRECTED PROOFS

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Millions of Americans use e-cigarettes. Despite their popularity, little is known about their health effects. Some suggest that e-cigarettes likely confer lower risk compared to combustible tobacco cigarettes, because they do not expose users to toxicants produced through combustion. Proponents of e-cigarette use also tout the potential benefits of e-cigarettes as devices that could help combustible tobacco cigarette smokers to quit and thereby reduce tobacco-related health risks. Others are concerned about the exposure to potentially toxic substances contained in e-cigarette emissions, especially in individuals who have never used tobacco products such as youth and young adults. Given their relatively recent introduction, there has been little time for a scientific body of evidence to develop on the health effects of e-cigarettes.

Public Health Consequences of E-Cigarettes reviews and critically assesses the state of the emerging evidence about e-cigarettes and health. This report makes recommendations for the improvement of this research and highlights gaps that are a priority for future research.

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