If people want to get high, they will find a way. For me, "Jenkem" is the ultimate argument ender

https://en.wikipedia.org/wiki/Jenkem

Fermented human waste in tupper ware in the sun for a day or two. How can you fight a war against that?

Instead try some other approach to education, management, and social state that reduces the number of people who feel driven to this in the first place perhaps.