Veterans’ exposure to toxic chemicals may harm their families’ health for generations, causing cancer, birth defects and other medical problems, according to U.S. Sen. Richard Blumenthal. He is co-sponsoring legislation to require that veterans be informed of their exposure to toxic substances and to establish a research center focusing on the illnesses of exposed veterans’ descendants. Blumenthal, the ranking Democrat on the Senate Veterans Affairs Committee, said that “the dimensions of the problem are unknown at this point” because no one has collected data on it. But, he added, “we know the toxic exposure is there. Science indicates it can cause genetic effects.” He cited brain and blood cancers as potential repercussions.