Off topic slightly and just my 2p.
In the industry i work in (pest control) chemicals are licenced for use in incecticides, herbicides, rodenticides etc... and they do get restrictions imposed on their use. For example, removing from the domestic markets inevitably leads to loss in sales and these sales losses mean it sometimes becomes non cost effective to pay the tens of thousands of pounds to go through the licensing process.
The products end becoming un economically viable.
This licensing process has already crept into vaping.