The Hobbit: Does Thorin Succumb to Dragon Sickness More Quickly Because Of The One Ring?

Right from the very beginning of An Unexpected Journey, Thorin is a fairly abrasive character. As The Hobbit trilogy develops and expands, this is shown to be in part because he is a fierce and proud leader, and in part because he has lived through some truly harrowing experiences. His life has made him very guarded, and very particular about the company that he keeps. Thorin makes several rash, bold and unwise decisions throughout the trilogy, including mocking the king of Mirkwood and rejecting the deal that Thranduil offers to let the dwarves out of the elven prisons, as well as leading Fili and Kili to Ravenhill, where a trap lies in wait and they all die.

Source: Gamerant