title: Study points out risks of smoking prior to surgery.
mesh_terms: D006801:Humans; D010100:Oxygen / Q000097:blood*; D011300:Preoperative Care; D012907:Smoking / Q000009:adverse effects* / Q000097:blood; D013514:Surgical Procedures, Operative; D013997:Time Factors
chemical_list: D010100:Oxygen