The application of the precautionary principle is essentially one whereby you assume harm or danger when you are absent absolute proof. I think that is taken seriously by health care professionals. I believe it forms the basis of all our regulatory frameworks for a vast majority of chemicals.
We also must recognize that we don't know what's coming down the pipe towards us. We also don't take into account in most of those regulatory frameworks the concept that some people are more susceptible than other people. Most of our occupational standards and most of our drinking water standards are designed around protecting the majority of the population, not around protecting everyone. To protect everyone would be...to basically not be exposed at all.