Yeah, not a perfect barrier, but if it's good enough that I'm not poisoned, do I care? I eat lots of delicious food that doesn't digest optimally. As for carc

Yeah, not a perfect barrier, but if it's good enough that I'm not poisoned, do I care? I eat lots of delicious food that doesn't digest optimally. As for carcinogenic effects, well, depends on what the timelines and cancer-rates you're talking about look like. We eat lots of things on Earth that are mildly carcinogenic over a lifetime, and the fact they are doesn't really stop us.