Computed nicotine flux by tobacco product category
| Product | N | Year span | Flux (µg/s) | |
| Mean (SD) | Range | |||
| Combustible cigarettes | 27 | 1988–2020 | 79(32) | 29–140 |
| ENDS | 52 | 2015–2021 | 29(23) | 3.7–110 |
| Heated tobacco products | 14 | 2018–2020 | 31(18) | 5.8–58 |
| Waterpipe | 8 | 2003–2019 | 11 (5.6) | 5.8–20 |
| Cigars/cigarillos | 9 | 1976–2018 | 62(35) | 12–110 |
| Roll your own | 3 | 1985–2014 | 69(28) | 52–100 |
| Bidi | 2 | 1988–2003 | 60 (6.8) | 55–64 |
| Kretek | 3 | 2014 | 47(16) | 29–60 |
| Nicotine patch and gum products | 4 | 2018–2019 | 0.4 (0.48) | 0.08–1.1 |
| Very low nicotine cigarettes | 1 | 2019 | 1.7(-) | – |
N indicates the number of products reported, while year span indicates years of publication for the studies included.
ENDS, electronic nicotine delivery systems.