Abstract
In the United States, individual states established a minimum legal sale age (MLSA) for e-cigarettes between 2010 and 2016 when a federal MLSA came into place. These policies provide a natural experiment from which we can better understand the effect that e-cigarettes have on youth combustible tobacco use. This paper uses National Youth Tobacco Survey data to estimate the effect of the gradual roll-out of e-cigarette MLSAs in the United States on youth e-cigarette use, cigarette use, and cigar use (i.e., cigars, cigarillos, or little cigars). Using an estimator designed to correct for dynamic heterogeneity in treatment effects, e-cigarette MLSAs are estimated to reduce lifetime e-cigarette use by approximately 25% and increase daily cigarette use and daily cigar use by approximately 35%. Therefore, these MLSAs operate as intended in reducing e-cigarette use, although at the expense of more dangerous combustible tobacco use. The Food and Drug Administration should consider the impact of e-cigarette availability in reducing youth combustible tobacco use as an important public health benefit of e-cigarettes in their regulatory activity.
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Data Availability
All data available via request from the author, except for indoor air law data that is licensed from the American Nonsmokers Rights' Foundation.
Notes
See here for press release of the FDA’s first e-cigarette marketing orders, allowing their legal sale: https://www.fda.gov/news-events/press-announcements/fda-permits-marketing-e-cigarette-products-marking-first-authorization-its-kind-agency (Accessed Sept. 26, 2022). Current premarket tobacco product marketing granted orders is provided here: Premarket Tobacco Product Marketing Granted Orders | FDA (Accessed Sept. 26, 2022).
E-cigarette MLSAs may increase the difficulty of purchasing e-cigarettes and awareness of potential risks, both of which could raise the costs vis-à-vis cigarettes. This could generate substitution to cigarette use despite previously existing cigarette MLSAs, as has been shown in several studies (Abouk & Adams 2017; Dave et al., 2019b; Friedman, 2015; Pesko & Currie, 2019; Pesko et al., 2016a).
E-cigarette Intelligence estimates an e-cigarette market size of $5.6 billion in 2021.
In June 2022, Juul was estimated to have 33.1% market share (https://vaporvoice.net/2022/06/02/vuse-continues-to-expand-u-s-market-share-over-juul/) (Accessed September 25, 2022).
One study finds the outbreak of “e-cigarette, or vaping product use associated lung injury” (EVALI) in mid- to late-2019 caused sharp increases in risk perception of e-cigarettes relative to cigarettes (Dave et al., 2020), despite this outbreak being caused by contaminated THC vapes rather than nicotine e-cigarettes. Another study finds that public risk perceptions of e-cigarettes are over-estimated, though not necessarily due to EVALI (Viscusi, 2020).
The NYTS wave was also collected in Fall 1999. I do not use this original wave because it is the only one of the waves to be collected in the fall and because it is very near in time to the spring 2000 wave.
N reflects the population without consideration to missing outcomes, which ranges from 1.7% to 2.8% depending on outcome and time horizon (2011–2017 or 2000–2017).
Four states (Alabama, Alaska, New Jersey, and Utah) have used a cigarette MLSA of 19 since 2005. By mid-2017, two states (Hawaii and California) had increased the MLSA to 21.
The analysis was approved by the Georgia State University IRB, Protocol # H18423. Archived versions of the NYTS are used that include geographical information. Please see the online appendix for additional information.
This can often be tested by a formal Goodman-Bacon decomposition (Goodman-Bacon, 2021), but this diagnostic aid cannot be used for imbalanced data.
I do not use state economic and policy controls with the C&S estimator because the -csdid- documentation reports that only the base-period values are used for the estimation if variables are time-varying.
There is also evidence from the e-cigarette tax literature (Abouk et al., 2021; Pesko et al., 2020) that current use margins respond relatively imprecisely to policy changes, but ever and daily use margins respond more precisely. One explanation could be recall bias. The NYTS defines current use as any use over the past 30 days. Non-daily users make up the majority of users, and these individuals may have greater difficulty in answering this question accurately. In contrast, it should be relatively easier for people to report daily use or ever use of e-cigarettes (defined as having tried an e-cigarette even once or twice). A second explanation is that non-daily users may not purchase their products directly and may be more likely to “bum” products off of others. “Bumming” behavior may respond differently to e-cigarette policies than the behaviors of daily users purchasing their own products. Either explanation could contribute to the estimated pattern of results.
For combustible tobacco use outcomes, the data is collected irregularly in earlier years (2000, 2002, 2004, 2006, and 2009). Our event studies imply that each “wave” is of equal temporal distance, which could introduce noise into pre-period coefficients for combustible tobacco use outcomes. This issue does not affect post-period coefficients, however, as the NYTS is collected each year that MLSAs come into place.
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Acknowledgements
Thank you to Hai Nguyen for helpful comments.
Funding
Dr. Pesko was supported by R01DA045016 from the National Institute on Drug Abuse of the National Institutes of Health and by a grant from the Institute for the Study of Free Enterprise at the University of Kentucky.
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Pesko, M.F. Effects of e-cigarette minimum legal sales ages on youth tobacco use in the United States. J Risk Uncertain 66, 261–277 (2023). https://doi.org/10.1007/s11166-022-09402-y
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DOI: https://doi.org/10.1007/s11166-022-09402-y
Keywords
- Electronic nicotine delivery systems (ENDS)
- E-cigarettes
- Vaping
- Cigarettes
- Cigars
- Smoking
- Minimum legal sales age
- Regulation