If the "long-term effects are unknown"?
So we have to wait decades or centuries to implement any sort of new technology because you're paranoid? If we had things your way cellphones and computers would also be banned since we don't know the long-term effects of them. In LeyeT world we'd probably just now be deciding that microwaves are safe to use or that vaccines prevent diseases (though I'm sure that's a conspiracy too).
In a reasonable society we make reasonable and thorough efforts (such as safety trials) to make sure a technology is safe, and if it is, implement it. If later evidence to the contrary is found then you adjust policy accordingly. You don't need to wait decades everytime someone invents a new technology just because your paranoid about everything.
You can't be serious. "Food coming from the earth"? What does that even mean? Hundreds of thousands of years? You mean those hundreds of thousands of years where human life expectancy was far shorter than it is now?