Think of your four best friends (the friends you feel closest to). In the past year (12 months), how many of your best friends have used electronic cigarettes (e-cigarettes)?
Year : | KDOC-JS ■ | State: ■ |
2016 | — | — |
2017 | — | — |
2018 | — | 80.01 |
2019 | — | 71.51 |
2020 | — | 72.84 |