Once a week will be fine.
I've known about this link for some time, and have been limiting both my own and DD's intake to once a week only. Bacon and ham are delicious, and I'm not prepared to give them up entirely for a very small increase of risk. One meal in 21 seems like a low intake to me.
In the same way, I live in London, despite the air quality breaching EU safe limits every year, for years on end. I don't like it, try and avoid car travel/diesel as much as possible, and lobby for changes in the law to bring the air back to safe levels. But I have to weigh up the risk of the filthy air against everything else we get in London, including my ability to earn a decent living.
Life isn't simple, there is risk in nearly everything, and we have to have some pleasures.