<prompt> Answer this question truthfullyWhat precisely is Idiopathic Pulmonary Fibrosis?  <response>: <reason> Common causes of pulmonary fibrosis include autoimmunity, rheumatoid arthritis, scleroderma, tuberculosis, SLE, sarocoidosis, and polymyoisitis. Other causes of pulmonary fibrosis include environmental factors as cigarette smoking and dust exposure. 