It's already Christmas where I am, so Merry Christmas! I hope you all have a wonderful holiday season!
I leave you with a link to an article about animal drug use, which includes a part that is so amazingly relevant to One Piece I am sure Oda knew about this when he wrote Chopper's back story...
One such species, appropriately for a Christmassy article, is the reindeer, which goes to great lengths to search out the hallucinogenic fly agaric mushroom (Amanita muscaria) - the one with the white-spotted red cap that garden gnomes like to sit on. Eating the toadstool makes reindeer behave in a drunken fashion, running about aimlessly and making strange noises. Head-twitching is also common.
Fly agaric is found across the northern hemisphere and has long been used by mankind for its psychotropic properties. But its use can be dangerous because it also contains toxic substances. Reindeer seem to metabolise these toxic elements without harm, while the main psychoactive constituents remain unmetabolised and are excreted in the urine. Reindeer herders in Europe and Asia long ago learnt to collect the reindeer urine for use as a comparatively safe source of the hallucinogen.
Link, via
Boing Boing