<prompt> Answer this question truthfullyWhat could be the possible diagnosis for a young patient with a heavy smoking history who presents with ulcers or gangrene of the distal fingers and toes, suggestive of a non-atherosclerotic segmental inflammatory disease affecting small- and medium-sized arteries?  <response>: <reason> The likely diagnosis for the patients condition is Buerger disease thromboangiitis obliterans. 