Baseline characteristics for the overall sample (n=30)
| Variables | Overall sample |
| Gender (male) (%) | 76.7 |
| Race (%) | |
| White | 60 |
| Non-white | 40 |
| Hispanic (%) | 66.7 |
| Age (in years)* | 22.4 (3.2) |
| Age of first smoking of waterpipe* | 17.4 (2.4) |
| Student status (%) | 66.7 |
| Waterpipe uses/month * | 4.6 (3.5) |
| Screening eCO*† | 1.9 (1.6) |
| Average time spent smoking waterpipe (%) | |
| Less than 30 min | 9.1 |
| 30–60 min | 66.7 |
| More than 60 min | 24.2 |
| Cigarettes use (%)‡ | 56.7 |
| Sharing waterpipe with others (%) | 96.7 |
| Location of waterpipe smoking (%) | |
| At home | 33.3 |
| At friends’ place | 23.3 |
| At a public place | 43.3 |
*Data presented as mean (SD).
†Exhaled carbon monoxide.
‡Less than five cigarettes/month.