The FDA has a system for compiling adverse drug reactions. One way outside the traditional medical path is a toll free number for anyone to report a problem with a drug. No evidence the drug caused the problem, but nonetheless it's logged. Patterns can turn up that way sooner and isn't a terrible idea.
What was clear was they know of 35 cases reported of a seizure occurring in someone who vaped. A few occurred while using illicit drugs as noted in the press release. There is no indication of any other medical history like having a preexisting seizure disorder. It's also not clear what was even being vaped. Even the notice stated there was insufficient evidence to tie the seizures to the vaping, simply that there were these reports. If they get a lot of that particular complaint I expect they'll look into it in more detail. We're upset because it involves vaping, but the statement could easily be made about Advil as the data collection is essentially the same.
I expect if they get more such phone calls they will dig further into the medical episodes and obtain more detailed information. What is simply called in on the adverse reaction phone line isn't proof of causation or even correlation. All they note is very high levels of nicotine can cause seizures as I an overdose (not nic sick). Maybe someone drank a bottle and it wasn't vaped. No one knows. I suggest to see what happens before panic ensues. Of course the general public doesn't get that, but that's a separate issue.
So if someone wanted a particular drug pulled off the market, say Chantix, they could organize a lot of people to randomly call that number and give bogus complaints? I would hope there is some sort of validation.