I was under the impression that the cinematics where animated using the same engine but with different mechanics. I.E. each movement had to be programmed in which would mean that the smoking that the Oracle did isn't an /emote command.At least, that's my impression of it. Which would mean the use of an animator to create the /smoke emote.
I get what you're saying regarding it not being the use of an emote command. I'm not an animator or 3D modelor so I can only guess at whats available to be used.
My guess is that the 3D model of the cigarette, including the part where it gets brighter as the Oracle puffs it, as well as the movement sequence where the Oracle raises her hand and smokes it have already been created in order to complete the chapter 1.2 cinematic. I don't know why they'd throw the cigarette model and motion sequence out.
I'm further speculating that the existing 3D model and animation could be triggered to play by using a /slash command just as all emotes work now.