science

Big industries and bad side effects that are known but hushed down are pretty common. From the simple fact that when an industry makes money out of something unhealthy, they rarely scream at the top of their lungs that it is unhealthy.

History has shown it to be pretty much common, and generally it is only accepted by the general public way too late.

And in the other direction, a small industry generally wouldn't have the lobbies needed to quiet down a health scandal.