I've been thinking for a while that there are so many possible sources of poisons it's very hard to monitor them all. But there is only one of me. So logically

I've been thinking for a while that there are so many possible sources of poisons it's very hard to monitor them all. But there is only one of me. So logically I should check if I have elevated levels of poisons. Then, and only then does it make sense to start monitoring my surroundings to trace where it came from.