Cancer is more of a genetic predisposition kinda thing and it could be triggered in various ways.
In the darkroom, the appropriate safety masks, gloves, clothes etc. etc. are recommended or necessary, depending on what You are doing.
Liver, kidneys, spleen etc, prophylactics/flush every now and then can help joyride Your bones above 100 years.
I doubt such lower % amongst vegan/vegetarians, unless they rely on biodynamic agriculture products, unfortunately most of them do not.
Diapozitivo, do You know Enzo Nastati?