The chemicals might have a short-half life that only affects people in direct contact with the active agent.
They have no-fly zones over all of their dens of iniquity for a reason.
It may be a lock and key system. The chemicals they spread might only become fully activated when it encounters another chemical. They can run lab studies proving chemical X is safe to ingest, never introduce chemical Y to the test subjects, and get it approved for use. As long as they avoid running a study including both chemical X and chemical Y, they can claim both are safe, and spread them all over with wild abandon. Meanwhile, in practice, chemical X and chemical Y cause cancer when in the body. One is a lock, the other is a key. As long as they avoid the "key" chemical, they are safe. Fluoride would be a good candidate for that.
I'm not claiming the above are good explanations, but they are possible.
Ok but how do the elites prevent themselves from breathing the same air as the peons
They probably have an antidote.
The chemicals might have a short-half life that only affects people in direct contact with the active agent.
They have no-fly zones over all of their dens of iniquity for a reason.
It may be a lock and key system. The chemicals they spread might only become fully activated when it encounters another chemical. They can run lab studies proving chemical X is safe to ingest, never introduce chemical Y to the test subjects, and get it approved for use. As long as they avoid running a study including both chemical X and chemical Y, they can claim both are safe, and spread them all over with wild abandon. Meanwhile, in practice, chemical X and chemical Y cause cancer when in the body. One is a lock, the other is a key. As long as they avoid the "key" chemical, they are safe. Fluoride would be a good candidate for that.
I'm not claiming the above are good explanations, but they are possible.