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.
Cancers of the Mouth and Throat People who drink and smoke are at higher risk for certain types of cancer, particularly those of the mouth and throat (12â14). Alcohol and tobacco cause approximately 80 percent of cases of cancer of the mouth and throat in men and about 65 percent in women (11,16â18).lcohol and tobacco co-use appears to substantially increase the risk of at least one type of cancer of the esophagus (19). Liver Cancer During the past decade, the incidence of liver cancer has increased dramatically in the United States (20).