Smokey's twirling around Ben and showing him images from the past (or reading his mind/memories), reminded me of the circle of ash around Jacob's cabin.
Smokey then disappeared before reappearing as Alex. Could Smokey have been the ring around the cabin, and appearing as 'Jacob'?
It seems to me at least Jacob and The Island have somewhat been used interchangeably by in the show and by Darlton outside of the show. Both the Island and Smokey are capable of apparitions. Could Smokey just be another 'face' of the Island?
The Island is the island, but is sentient.
Jacob is one 'face' of the island.
Smokey is one 'face' of the island.
Apparitions are one 'face' of the island.
Whispers are one 'face' of the island.
Alpert is one 'face' of the island.
Collectively, they represent the 'sentient being' of the Island, and transcend time and space.