Based on the average residues found in foods to which the chemical is routinely applied, and on the proportion of the average American diet that these foods comprise, EPA estimates that a 70-year exposure might yield a 1 in 1,000 risk of contracting cancer--roughly the same order of magnitude, Lapsley says, as the risk his agency came up with for ethylene dibromide (EDB), banned last year (SN: 3/10/84, p.