Question: What is (are) Buerger disease ?
Answer: Buerger disease is a disease of the arteries and veins in the arms and legs. The arteries and veins become inflamed which can lead to narrowed and blocked vessels. This reduces blood flow resulting in pain and eventually damage to affected tissues. Buerger disease nearly always occurs in association with cigarette or other tobacco use. Quitting all forms of tobacco is an essential part of treatment.
Source: GARD

Question: What causes Buerger disease ?
Answer: What causes Buerger disease? Buerger disease has a strong relationship to cigarette smoking. This association may be due to direct poisioning of cells from some component of tobacco, or by hypersensitivity to the same components. Many people with Buerger disease will show hypersensitivities to injection of tobacco extracts into their skin. There may be a genetic component to susceptibility to Buerger disease as well. It is possible that these genetic influences account for the higher prevalence of Buerger disease in people of Israeli, Indian subcontinent, and Japanese descent. Certain HLA (human leukocyte antigen) haplotypes have also been found in association with Buerger disease.
Source: GARD