Bruce66423 shares a report from The Guardian: Last week, a massive new study concluded that lead is 10 times more dangerous than thought, and that past exposure now hastens one in every five U.S. deaths. Researchers at four North American universities, led by Bruce Lanphear, of Simon Fraser University in Vancouver, studied the fate of 14,289 people whose blood had been tested in an official U.S. survey between 1988 and 1994. Four fifths of them had harbored levels of the toxic metal below what has, hitherto, been thought safe. The study found that deaths, especially from cardiovascular disease, increased markedly with exposure, even at the lowest levels. It concluded that lead kills 412,000 people a year -- accounting for 18% of all U.S. mortality, not much less than the 483,000 who perish as a result of smoking. The study has been published in the Lancet Public Health journal.