Just at how the 4th couch represents the present, I think the 5th represents the uncertainty of the future. How is all this going to affect Luffy's future?
Mugen_fuego25 said: He's been injected twice. First in impel down, second in marine HQ.
No. The Healing Hormones were the only ones who were stated to have that side-effect, and the only time he was injected was in Impel Down to save him from Magellan's poison.
Healing Hormones =/= Vigour Hormones
The Vigour Hormones are the ones which he recieved twice, and they don't have such side-effect, they just fool the body into ignoring its own damage/pain while givig a boost of energy. The only stated side-effect of this type of hormones, is the fact that once the hormone's effect wears off, he will feel all the damage/pain he accumulated, all at once.