Re: Risk assessment...
Our decisions shouldn't be based on fear, but on asking if the benefit is worth the risk.
From the (little) I know of cancer, it's clear to me that it is basically a risk of aging - if you live long enough, then your body is exposed to enough of (X) that it starts being a health risk. It matters a little what (X) is, since for some substances the treshold is higher or lower, but the bottom line is that the older you get, the higher the risk. whatever your lifestyle is like.
Also, 50g a day... I eat plenty of bacon, salami, ham etc and even then it's probably still less than 50g/day.