Some of the variation in weight that is not. accounted for in Tables 1 or 2 is due to the variation. in the wood density of the different species. AdjustÂ­. ment factors have been developed to account for the. variation by species. The adjustment factors were. each species by the average density of all of the trees.
For example, regular smoking increases the risk of developing lung cancer; therefore smoking is a risk factor for lung cancer. The risk factors for mouth cancer include: 1  Smoking - studies indicate that a 40-per-day smoker has a risk five times great than a lifetime non-smoker of developing oral cancer.  Chewing tobacco.
Mouth cancer can occur anywhere in the mouth, including the lips, tongue and throat, as well as the salivary glands, pharynx, larynx and sinuses. Although the exact cause of oral cancer is unclear, there are certain lifestyle factors that can put someone at risk for this disease. Tobacco of any kind â cigarettes, cigars, pipes and smokeless tobacco â increase your risk for oral cancer.