Proportions of cancer deaths attributed to various different factors
| Percentage of all cancer deaths | ||
|---|---|---|
| Factor or class of factors | Best estimate | Range of acceptable estimates |
| *Allowing for a possibly protective effect of antioxidants and other preservatives. | ||
| Tobacco | 30 | 25–40 |
| Alcohol | 3 | 2–4 |
| Diet | 35 | 10–70 |
| Food additives | <1 | −5* to −2 |
| Reproductive and sexual behaviour | 7 | 1–13 |
| Occupation | 4 | 2–8 |
| Pollution | 2 | <1–5 |
| Industrial products | <1 | <1–2 |
| Medicines and medical procedures | 1 | 0.5–3 |
| Geophysical factors | 3 | 2–4 |
| Infection | 10? | 1–? |
| Unknown | ? | ? |