1. American Nonsmokers' Rights Foundation — U.S. smoke-free laws including e-cigarette provisions, 2026 update
2. U.S. Department of Transportation — Ban on e-cigarettes on flights, 49 CFR Part 252
3. Truth Initiative — Public perceptions of e-cigarette use and secondhand exposure survey, 2025
4. CDC — Secondhand e-cigarette aerosol: what we know, 2026
5. American Lung Association — E-cigarettes and secondhand aerosol, 2026
6. National Conference of State Legislatures — State e-cigarette laws and indoor use bans, 2026
7. International Civil Aviation Organization (ICAO) — Global ban on e-cigarettes on commercial flights
8. Hotel Association of America — Hotel smoke-free policy trends (e-cigarette inclusion), 2025
9. Society for Human Resource Management — Workplace e-cigarette policies, 2025 survey
10. FDA — E-cigarette regulations and public health guidance, 2026
11. European Respiratory Society — Secondhand e-cigarette aerosol position statement, 2024
12. Action on Smoking & Health (ASH) — Public attitudes toward vaping in shared spaces, 2025