Boiled cottonwood bark, skim off the scum and dry it = aspirin.
(Better/more accurate description of how to make the distillate here:
https://cedarmountainherbs.com/cotto...ain-relievers/ )
(I am not being snarky, I do not want a discussion on the various merits of any real-world drug situations coming up...with that said...)
Pot grows in most conditions, it is effectively a weed, and has at the very least, palliative effects.