I just looked at the jungle mob respawn timings and i noticed that the dragon already spawns at 2:30. It's nearly impossible to kill it by then but then i thought; what if every team member gets smite and just walks there and smites the dragon.
dragon having 3500hp + 240/min smite having 460 + (30 * champ level)
Assuming everybody is level 2 by the time 2:30 is reached 460 + (30 * 2) = 520 * 5 champs = 2600 damage
Assuming everybody is level 3 by the time 2:30 is reached 460 + (30 * 3) = 550 * 5 champs = 2750 damage
So its pretty safe to say that the damage purely made by smiting is somewhere between 2600 and 2750. Leaving the dragon with only 750 - 900 hp left. This is quickly cleaned up by the 2 bot champs or bot champ and jungler (or something like that).
This can obviously be repeated multiple time each resulting in a quick dragon and possible a quicker baron.
My question is; is it worth taking smite over for example flash (if your champ has a natural escape) or ignite/exhaust for the damage finisher?