Been around for ages (and ages)...
Modern manufactured processed meats have loads of nitrites, traditional recipes had nitrates...there's a difference there.
It's interesting the agendas/spin on it.
18% increased risk of colorectal cancer, and the talking heads are talking equivalent to smoking...vasectomy has a 10% increased risk of prostate cancer associated with it, and particularly the nasty/aggressive ones, and it's "inconclusive".
Sad story, possible related, probably not. A workmate died as he walked out the front door of a heart attack at 38. A good mate was horridly affected, and went on a paleo health kick, but I couldn't convince him that 1/4lb of ham every day for two years wasn't what paleo actually looked like...he died horribly of GI cancer (that missed all the typical screenings).