Accordingly to research published in the Journal of Periodontology, individuals with periodontal disease have 1.24-fold increase in lung cancer. The study evaluated 321,420 subjects. Alcohol consumption, smoking habits, and those diagnosed with diabetes were at a 1.36-fold increase in lung cancer. Women with periodontal disease are more likely then men to develop lung cancer according to this study. Scientists are examining if certain oral bacteria may be involved in the development of cancer cells in the lungs. The successful treatment of periodontal disease may lead to a substantially reduced lung cancer risk.