People try to link anything to cancer now. The hopelessness of not having a cure for it means that all we can do is attempt to prevent it, which means studying correlations about causes. The problem with this research though, is that they usuall either interview people who have had cancer, asking them a range of questions, for instance, "Do you eat bread?" "You do, okay, how frequently?" "Very frequently? Thanks a bunch."
Then when, unsurprisingly, a bunch of other people show this "correlation", the news jumps on it because they know that they can get the line out a few hours before they go on their air.. "New shocking revalation that could prevent YOU from getting cancer... more at 5." Of course every gullible person watches hoping that they can seal the deal and prevent themselves from EVER having cancer watches...
Correlations in causes of cancer and certain actions or products are nothing more than frequent coincidences. Only once in every so often can an actual medical and/or scientific proof be given that actually gives a good reason behind alarming people.