There's actually no evidence of this. None.
There is evidence - strong evidence - that cutting out red / processed meat will reduce the risk of getting bowel cancer. Even then, there's no evidence that cutting out red meat and processed meat makes any difference once the disease is present.
Just as cutting out cigarettes if you have lung cancer makes no difference to the cancer's progression (though you may breathe more easily, of course!).
We all need selenium and vitamins, but there's no evidence that exceeding 'normal' levels helps in the slightest, and overdosing on 'supplements' can seriously harm you while making Commercial Quacks rich. Or Snake Oil Salespeople!
I'm with Chris J: I'm going to live my life while I've got it - I don't want to survive another 20 years - I want to live another 20 years.
And that includes bacon.