History of lung disease; Exposures to lung toxins; Tobacco use; Related hospitalizations; Spinal cord trauma; Extreme obesity; Use of O2, inhalers, nebulizers, immunosuppressant therapy; Previous intubation; Thoracic or abdominal surgery; Exercise; Immunizations; Anorexia; Weight gain/loss; Diaphoresis; Dizziness; Dyspnea, wheezing, cough, sputum, palpitations, swollen feet; Changes in sleep pattern; Fatigue; Headache; Chest pain; Anxiety; Restlessness; Agitation; Pale, cool, clammy or warm, flushed skin; Use of accessory muscles; Shallow breathing with increased respiratory rate; Tachycardia progressing to bradycardia; Extra heart sounds; Abnormal breath sounds; Hypertension progressing to hypotension; Abdominal distention, ascites; Somnolence, confusion, delirium; Changes in pH, Paco2, Pao2, Sao2; Decreased tidal volume, FVC; Abnormal x-ray; Normal pulmonary artery wedge pressure (noncardiogenic pulmonary edema