So, something that would be badass on a few different levels if developed in game: A cyberwere that constantly delivers to you "just the right amount" of whatever drug it was filled with. And maybe a higher end model or a add on to dispense 2-3 drugs at a time.
Think a Juicer characrter if you'e ever played Rifts, or Bane from the Batman series if you havn't There would of course be consequences for switching drugs, or running out of your drug of choce, but not only would it be pretty damn cool, it'd tap the drug market in a whole new way.
Damn I'm stoned.