That is true for the health risks, it will take a decade at least to get those data. But I don't think that FDA is going to go that route. InsteAd, I think they are going to look at
vaping initiation among young people and whether smokers are successfully using
vaping to quit. FDA doesn't really have the authority to ban based on health risks (they still allow cigarettes, yeah?), but they can ban things based on marketing.
FDA is currently worried that young people will start
vaping and eventually transition to combustibles. If they have data demonstrating that, they will shut us down.
As you say though, they still don't have those data, but it won't take nearly as long to establish that as it will to establish health effects. Pay more attention to the behavioral research if you're worried about FDA.