"Some of us read about the fabulous Roman aqueducts and plumbing systems -- the most advanced in the world in their time -- and shake our heads at how the Romans could be 'stupid enough' to line some of the pipes and containers with lead! I bet some Romans had suspected something wrong all along, but the experts of their day didn't have the technology to detect the cause/effect of lead.
Who's to know if a few hundred years into the future, folks will shake their heads at the way we poison ourselves -- what with cell phone radiation, plastic and aluminum "food grade" containers, etc.??? Unfortunately, we don't have definitive ways of measuring the cause/effect today -- nor do we have any safe/economical ways of replacing/eliminating plastics and metals..."
Oh, there are ways. One of these ways is called "scientific experiment," or "rational inquiry." These experiments are being performed all the time, and the results are published in peer reviewed scientific journals. The Journal of Cancer Epidemiology, Nature, etc.
Peer reviewed scientific journals are the closest you can get to the truth, short of performing your own experiments, as any student of science will tell you. (I know, I majored in Chemistry and minored in Mathematics.)
If you read many of the peer reviewed scientific journal articles that have been published regarding human health, and compare what these studies suggest with what government/industry recommends, you will be shocked.
It's true that industry/government tries to squash such information, and that honest studies of potentially hazardous consumer product materials/ingredients tend not to receive funding, but such studies occur nonetheless, due to some Universities' and Professors' commitment to scientific and academic integrity.