Im guessing opiates of some kind - Syrup, pills, maybe H only because opiates in moderation do not make you look like a " addict " if your smoking crack, snorting coke, or meth anybody could tell by looking @ the person - opiates are tough pinned eye's are a characteristic but not always the case.
I would say he likes Shrooms, Acid, Ketemine, or Thizz then some opiates to fall asleep........ IMO