SPI derived from extant literature for tobacco filler of combustible tobacco product types
| Tobacco product type | SPI | Nicotine (mg/g) | Sugars (mg/g) |
| Waterpipe (Ma’assel) | 290 | 1.2* | 350† |
| Pipe | 1.6–13 | 14.4‡ | 24–189§ |
| Cigarettes | 0.4–9.5 | 19¶ | 7–180§ |
| Cigars | 0.4–0.5 | 15¶ | 6–7.5§ |
*Kulak et al, 201765
†Brinkman et al, 201835
‡Jacob et al, 199966
§Elson et al, 197234
¶Lawler et al, 201767
SPI, Starter Product Index.