Kija probably wouldn't unless he knew what it was, the effects and the like. Jae-Ha experiments occasionally with drugs in canon, but Kija seemed a little shocked at the fact that he has. And while Kija's not at the right point in canon, drug abuse has become a rather big theme in AkaYona. Due to a drug (Nadai) that has swept through parts of the country and has severe negative effects, it has become dangerous due to how addictive it is. Jae-Ha ended up drugged with it once and it wasn't pretty. :'|
BUT. Something like the drugs in Marina would be fun. And I'd absolutely love to do something with Lulu regarding it all! I could see lulu considering it, and I really just want these two to talk again anyway.