Researchers say cancer-causing chemicals called trihalomethanes (THM) are created as a byproduct of chlorinating water and increase the risk of the disease developing.

Paraffin is a known carcinogen, and hydrogen peroxide can harm the digestive system. Chopsticks irresponsibly disposed of can contaminate water and soil quality.

But it's not just water, the carcinogenic heavy metals are also entering the food chain.