; (ii) pregnant women; (iii) the elderly; (iv) individuals with preexisting medical conditions; (v) workers who may be exposed to chemical substances and mixtures; (vi) residents in communities subject to disproportionate exposures; and (vii) members of any other appropriate population identified by the Secretary. . (b) Delayed applicability Section 409(j) of the Federal Food, Drug, and Cosmetic Act, as added by subsection (a), applies beginning on the date that is 2 years after the date of enactment of this Act.