The world has been studying what causes cancer for more than 50 years now. Countless scientists and epidemiologists have dedicated themselves to evaluating the link between a specific agent and cancer — sometimes even putting their lives at risk.

Yet, after all that time and all the millions spent on the subject, most of us don’t seem to know much about what causes cancer and how to decrease our personal risk. Contradictory studies pop up on social media feeds every fortnight and do nothing to help reveal the actual science behind our understanding of carcinogens.

Is the evidence really as blurred as it seems, or are we simply not looking in the right places for information? Test your knowledge about cancer-proofing your life below, with the help of data from the World Cancer Research Fund International (WCFI) and the International Agency for Research on Cancer (IARC).