Most of us do not actually look into the composition of all that we buy from the supermarkets. That applies to food too.
With the other stuff, it might not be as harmful as it is with our food since the consumption is directly proportional to our health.
Aspartame is found in over 6000 products that are consumed by people world over. It is actually the most widely used artificial sweetener found in food products today. Diet cokes, sugar free gums, vitamins, jello, and other table top sweeteners all contain some amount of aspartame in them.