The baseball world is mourning the death of Tony Gwynn. One of the all-time baseball greats died this week at the age of 54 from oral cancer. Gwynn, who spent his entire career with the San Diego Padres, like many of his fellow players, used smokeless tobacco. Former Buffalo Bills quarterback Jim Kelly, who said he never smoked or used smokeless tobacco, recently announced that his oral cancer had returned and has undergone additional surgery. Despite efforts to discourage its use, some baseball players still use smokeless tobacco, a leading cause of oral cancers, according to Dr. Todd Doyle, Chief of Radiation Oncology at New York Oncology-Hematology.