Participant characteristics (N=2218)
| Characteristics | % |
| Age, mean (SD) | 43 (15) |
| Sex | |
| Female | 56 |
| Male | 44 |
| Gay, lesbian or bisexual | 13 |
| Hispanic | 9 |
| Race | |
| American Indian or Alaskan Native | 2 |
| Asian | 4 |
| Black or African–American | 10 |
| Native Hawaiian or Pacific Islander | <1 |
| White | 80 |
| Other | 4 |
| Education | |
| High school or less | 30 |
| Some college | 31 |
| College graduate or associate’s degree | 32 |
| Graduate degree | 7 |
| Household income, annual | |
| $0–$24 999 | 26 |
| $25 000–$49 999 | 33 |
| $50 000–$74 999 | 20 |
| $75 000+ | 21 |
| Low income, <200% of 2018 federal poverty level | 30 |
| Tobacco use | |
| Current e-cigarette user only | 20 |
| Current smoker only | 40 |
| Dual current e-cigarette user and smoker | 40 |