There is a max 10% genetic risk and also getting older makes the body more fragile for every illness not just cancer but the causes as outlined in wikipedia are 90% environmental.
Unhealthy eating (especially very salty/spicy/fermented foods), alcohol use, and so on also classify as environmental factors. But they are not caused by pollution or chemical-laden foods, merely bad life choices. Copious quantities of red meat isn't good, organic or no.
I don't meant to imply our bad handling of the planet causes no cancer, it certainly does. But it does not cause anywhere close to 90% of cancer cases. Not by a long shot.
The wikipedia article on capsaicin links to this study as well as several others and indicates that capsaicin may have carcinogenic or anticarcinogenic properties based on several studies: http://en.wikipedia.org/wiki/Capsaicin#Effects_of_dietary_co...
You probably shouldn't be all that concerned about eating spicy food... on the other hand, if you don't smoke, you eat well, and you aren't obese, you're roughly 55-65% less likely to die of cancer: http://en.wikipedia.org/wiki/Cancer#Causes
The point stands. How many people consciously make an effort to prevent cancer in every aspect possible? On a personal level as much as a societal level, we're doing little to address the preventable causes of cancer. Why are so many people making so many "bad life choices"?