Which of the following is not a risk factor for postoperative pulmonary complication?

Ans. (C) Patient with 7 pack years of smoking(Ref: Millers Anesthesia 8th Ed; Page No- 1114)Postoperative Pulmonary ComplicationsPatient-Related#History of Cigarette smoking exceeding 40 pack-years.#Alcohol use#Age 70 years or more#ASA-PS class >=2#BMI of 30 or more#COPD#Heart failure#DeliriumProcedure-Related#Thoracic surgery: Postoperative pulmonary complications develop in 5% to 10% of patients undergoing non-thoracic surgery and in 22% of high- risk patients.#Abdominal surgery#Vascular surgery#Use of general anesthesia: Planned general anesthesia (especially with endotracheal intubation)#Neurosurgery#Head and neck surgeryLaboratory Test-Related:#Albumin concentration less than 35 g/dL#BUN level >7.5 mmol/L (>21 mg/dL)#Abnormal CXR