There is an acceptable dose, which is effectively background. Basically statistically insignificant increase in cancer risk.

While you are correct that any amount of carcinogens could cause cancer the idea that there is no safe dose suggests that any amount is deadly, which is simply untrue. We require some carcinogenic products to live (looking at you bananas) and produce others naturally.

Not to say that reducing known carcinogenic products from our lives is a bad thing. I would certainly encourage that but a little bit is ok.