Despite widespread use of "revelationary aids" by its "Visionary" farseers, Craftworld Ecoleg-Yfory has had a prohibition at pain of exile on all use of narcotic substances for 1000 years. So deeply ingrained in its culture that warbands have been known to refuse cooperation with otherwise friendly drukhari kabalites and wyches who rely on combat drugs for clarity on the battlefield
Basically trying to flesh out the Craftworld with "realistic downsides" to being a corporate eco utopia modeled off of like late 2000s Apple & general Silicon Valley culture with a lot of old corporate former hippies that took a sharp conservative turn. And also do a funny intervention on the idea of "wood elves" as druggie forest dwellers