One of Health Secretary Robert F. Kennedy Jr.’s top public affairs spokespeople resigned from his post over the FDA's fruit-flavored e-cigarettes authorization and its potential impact on minors, according to a resignation letter to President Donald Trump reviewed by ABC News. In the letter, Richard Danker, the former assistant secretary for public affairs at the Department of Health and Human Services, accuses senior agency officials in Kennedy's immediate office of approving e-cigarette flavors that would allegedly expose children to "nicotine addiction, lung damage, and a higher risk of cancer."  Danker also said the vape authorization "undermines" the department's recent guidance document related to youth risks of flavored nicotine, according to the letter. Secretary of Health and Human Services Robert F. Kennedy Jr. speaks during an event on advancing health care affordability in the Oval Office of the White House, April 23, 2026 in Washington.…