A lot of talk about BLTs, you need to watch that lettuce! Only a little tongue in cheek.
Lettuce has 13 to 267 mg of Nitrates per 100 grams. Bacon, it has 380mcg* per 100grams. The lettuce has 34 to 702 times more Nitrates than the bacon.
https://www.webmd.com/diet/foods-high-in-nitrates
* note micro vs milli
"your gut biome can break down nitrate into
nitrite, which can cause health complications such as an increased risk of cancer. Nitrate is an inorganic, water-soluble chemical. Your body makes around 62 milligrams (mg) of nitrites a day, but the majority of nitrates come from your diet. On average a person living in the United states consumes 75 to 100 mg of nitrates a day."
Pick the food you want to get your poison from, I guess!