Mark, while I don't usually don't like to speak in absolutes, we know what causes our oral cancers. Other cancers are more obtuse. Everything you have said is true, but not necessarily for oral cancer. If you didn't end up here through lifestyle choices ( alcohol and tobacco) you almost certainly came to it through a virus. Only about 5% come from unknown causes.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.