All of the following are risk factors for about 80% of cancers EXCEPT one:

Tobacco, alcohol, and UV/sun exposure are major, well-established, modifiable lifestyle risk factors that together account for a large share of preventable cancers (including oral cancers). Chronic inflammation is also linked to cancer risk biologically, but it is not typically grouped among the 'big three' modifiable lifestyle exposures said to account for the ~80% of preventable cancer figure commonly cited in public-health messaging, making it the better 'exception' here.