Carcinogens are found in many foods--as are offsetting cancer-fighting chemicals--but in small quantities. If we wanted to avoid all carcinogens, we'd have to stop eating altogether. But there are 10 milligrams (mg) of known carcinogens in a single cup of coffee. To put that into perspective, 10 mg is probably more than all the synthetic pesticide residues you could get from eating non-organic food for an entire year. In one cup.
