Wouldn't it be nice if Data could set up some kind of warning not to go there so no one else so compliant won't be killed to keep the secret?
Picard: Make it so. And put out a hazard advisory to Starfleet
They put out a hazard warning at the end. Plus, the only reason this happened is because Data was on board & immune. Data is nearly unique in their universe. The likelihood of this happening again is remote
So I wonder how they got around Beverly's moss. They'd have to kill it, or replant them so they'd be at the right growth after "30 seconds". Also not sure how they 'correct' Troi's hallucinations the second time around.
Star Trek magicky stuff. Replicate new plants of the proper growth & have the aliens work some extra memory voodoo on her to correct the issue. Not a big leap in believability really... For Star Trek, of all things