The largest extrinsic factor (causally effective), should be the environment's physiological interaction with cells that have accumulative exposure: the aliment

The largest extrinsic factor (causally effective), should be the environment's physiological interaction with cells that have accumulative exposure: the alimentary system. Lower incidences of alimentary cancers should be the hallmark result of bans on various carcinogenic additives. The question should be how low the rates can inherently go based on diet alone, and to then proceed to narrow down the scope of any further factors.