| Sample | Calcium (µg/g) | Chromium (µg/g) | Nickel (µg/g) | Zinc (µg/g) | Author/Year | Country |
| Snuff | 9.7 - 12.6 | 24.1 - 33.3 | 41 - 69 | 153 - 172 | This study | Nigeria |
| Leaves | 10.7 - 14.9 | 34.5 - 37.0 | 41 - 56 | 167 - 183 | This study | Nigeria |
| Leaves | 8.6 - 9.5 |
| 2.7 - 3.6 | 154 - 193 | Adamu et al., 1989 | USA |
| Cigarettes | 9.1 - 3.7 |
|
| 2.1 - 161.6 | Golil et al., 2007 | Greece |
| Cigarettes | 0.2 - 6.1 | 0.0 - 5.6 | 1.8 - 2.7 | 0.9 - 9.2 | Stephens et al., 2005 | UK |
| Cigarettes | - |
| 2.0 - 400 |
| Iskander et al., 1986 | USA |
| Cigarettes | 0.0 - 6.8 |
|
|
| Lugan-Moulin et al., 2006 | Several countries |
| Snuff | 1.1 - 1.7 |
| 1.6 - 2.9 |
| Pappas et al., 2008 | Alaska |
| Leaves | 0.9 - 2.0 |
| 0.4 - 0.7 |
| Pappas et al., 2007 | Alaska |
| Snuff | 3.6 - 3.7 | 0.2 - 0.3 | 0.0 - 0.5 | 22.5 - 25.5 | Akpoveta et al., 2011 | Nigeria |
| Snuff | 1.7 - 3.2 |
| 1.0 - 1.2 |
| Addo et al., 2011 | Ghana |
| Leaves | 0 - 77 |
|
|
| Fusun et al., 2013 | Turkey |