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Characteristics of e-cigarette–related YouTube videos.
| Video categories | Videos, n | Views, mean (SE) | Likes, mean (SE) | Daily views, mean (SE) | Daily likes, mean (SE) | Posted days, mean (SE) | Video duration (seconds), mean (SE) |
| Vaping-warning | 141 | 380,671 (166,961) | 5523 (3444) | 822 (527) | 15 (12) | 605 (55) | 759.5 (134) |
| Neutral | 38 | 251,231 (89,292) | 2732 (1276) | 506 (278) | 14 (11) | 1128 (159) | 561.1 (159) |
| Provaping | 161 | 778,569 (293,749) | 7300 (3014) | 1077 (493) | 12 (6) | 1806 (76) | 370.8 (26) |
