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, also called oral cancer, describes a cancerous tumour, growth or sore developing in the mouth. On the gums. Mouth cancer is related to throat cancer affecting the throat (pharynx). Mouth cancer can be life-threatening if it is not diagnosed and treated as early as possible. Mouth cancer can develop in the mouth itself, called primary oral cancer. It can also spread to the mouth from cancer elsewhere in the body. This is called secondary oral cancer, or metastatic oral cancer.