Dragon sickness

"Dragon-sickness. I've seen it before. That look. That terrible need.It is a fierce and jealous love, Bilbo.It sent his grandfather mad."

- Balin to Bilbo Baggins on the gold sickness and Thorin Oakenshield's Dragon sickness, also known as the Gold sickness is a type of sickness that affects humans, dwarves, elves, and dragons.

Known victims

 * Smaug -The last of the dragons of Middle Earth; his greed for the Dwarfs gold led him to destroy the town of Dale and the Dwarf kingdom under the Lonely Mountain; years later although he told Bilbo Baggins he would not part with a single coin from the treasure trove he had stolen, he laughliny admitted he would need wish to see Thorin Oakinshield with the Arkenstone just to see Oakinshield waste away from Dragon sickness.
 * 'The Master; greedy leader of Lake Town in the book "The Hobbit" he dies in the wastes hoarding his share of gold; in the movie version while trying to escape the burning town with his stolen treasure-he and his ill gotten loot are sent to the bottom of the Lake when the dead body of Smaug falls on top of him.
 * Thror - King of Durin's Folk; gained dragon sickness after hoarding the gold his miners found.
 * Thrain-Thror's son who had a Dwarf's Ring which excited his greed so that he entered the Mines of Moria where he was captured, tormented and killed
 * Thorin Oakenshield - Briefly had the gold sickness, but hearing the sounds of his friends and family echoing in his mind, Thorin was restored. However, during the gold sickness, he trusted no one, apart from Bilbo Baggins