Average past 30-day estimates of toxicant exposures attributable to waterpipe tobacco smoking (WTS) and cigarette smoking among US adults aged 18–30 years
| Toxicant | WTS* | Cigarette smoking* | Proportion attributable to WTS† |
| Smoke volume, L | 31.78 (10.54) | 24.67 (2.50) | 54.87 (37.54 to 72.20) |
| Tar, mg | 264.83 (102.71) | 1007.13 (199.52) | 20.83 (6.47 to 35.18) |
| Carbon monoxide, mg | 84.54 (31.56) | 727.85 (61.66) | 10.33 (3.34 to 17.33) |
| Nicotine, mg | 1.77 (0.48) | 74.58 (11.54) | 2.36 (0.91 to 3.82) |
*Means and SD derived from Monte Carlo analyses with 5000 repetitions.
†95% CIs constructed using SD from 5000 repetitions.