'Dietary Pesticides are 99.99% ALL NATURAL. ..Plants produce toxins to protect themselves against fungi, insects, and animal predators. Tens of thousands of these natural Pesticides have been discovered, and every species of plant analyzed contains its own set of perhaps a few dozens toxins. When plant are stressed or damaged, such as during a pest attack, they may greatly increase their natural pesticide levels, occasionally to levels that can be acutely toxic to humans. ..The human intake of these toxins varies markedly with diet and would be higher in vegetarians.
..We estimate that Americans eat about 1.5g of natural pesticides
per person per day, which is 10,000 times more than
they eat of manmade pesticide residues.
 Among naturally occurring pesticides, about HALF are CARCINOGENIC.

.. natural pesticides that are rodent CARCINOGENS are present in the following foods:
anise, apple, apricot, banana, basil, broccoli, Brussel sprouts, cabbage, cantaloupe, caraway, carrot, cauliflower, celery, cherries, cinnamon, cloves, cocoa, coffee, collard greens, comfrey herb tea, currants, dill, eggplant, endive, fennel, grapefruit juice, grapes, guava, honey, honeydew melon, horseradish, kale, lentils, lettuce, mango, mushrooms, mustard, nutmeg, orange juice, parsley, parsnip, peach, pear, peas, black pepper, pineapple, plum, potato, radish, raspberries, rosemary, sesame seeds, tarragon, tea, tomato, turnip. '
[B. N. Ames, M. Profet and L.S. Gold, 1990, 'II. Dietary Pesticides (99.99% All Natural)'
in Proceedings of National Academy of Sciences USA 87, 7777-7781]

Some rodent carcinogens present in the above reported natural foods:

Acetaldehyde methylformylhydrazone, allyl isothiocyanate, arecoline.HCl, benzaldehyde, benzyl acetate, caffeic acid, capsaicin, cathecol, clivorine, coumarin, crotonaldehyde, 3,3-dihydrocoumarin, estragole, ethyl acrilate, N2-gamma-glutamyl-p-hydrazinobenzoic.acid, hexanal methylformylhydrazine, p-hydrazinobenzoic acid.HCl, hydroquinone, l-hydroxyanthraquinone, lasiocarpine, d-limonene, 3-methoxycatechol,  8-methoxypsoralen, N-methyl-N-formylhydrazine, alpha-methylbenzyl alcohol, 3-methylbutanal methylformylhydrazone, 4-methylcatechol, methylhydrazine, monocrotaline, pentanal methylformylhydrazone, petasitenine, quercetin, reserpine, safrole,  senkirkine, sesamol, symphytine. [Ames, B.N. & Gold, L.S., 2000, Mutation Research,  447, 3-13]

Natural Rodent Carcinogens present in roasted coffee:
Acethaldehyde, benzaldehyde, benzene, benzofuran, benzo-alpha-pyrene, caffeic acid, catechol, 1,2,5,6-dibenzanthracene, ethanol, ethylbenzene, formaldehyde, furan, furfural, hydrogen peroxide, hydroquinone, isoprene, limonene, 4-methylcatechol, styrene, toluene, xylene
[Ames, B.N. & Gold, L.S., 2000, Mutation Research, 447, 3-13]

[See also: Gold, L.S., Slone, T.H. and Ames, B.N. 'Overview of analyses of the Carcinogenic Potency Database.' In "Handbook of Carcinogenic Potency and Genotoxicity Databases.", L.S. Gold & E. Zeiger, Eds., CRC Press, Boca Raton, FA, 1997]