The agency is proposing allowing other tastes for vapes, like mint, coffees, spices or tea, to appeal to adults. At the same time, illicit candy-flavored…

Proponents of vaccines warn that the efforts will further dismantle the immunization infrastructure and lead to more outbreaks of disease.

The F.D.A.’s refusal to examine the company’s mRNA shot drew widespread criticism from doctors and was divisive within the agency.