Doctors aren’t just blaming smoking for a rise in head and neck cancers, instead they think oral sex could be the culprit. There’s around 12,800 new head and neck cancers in the UK every year. Doctors aren’t just blaming smoking for a rise in head and neck cancers, instead they think oral sex could be the culprit. There’s around 12,800 new head and neck cancers in the UK every year.