Final answer:
Hypercapnic respiratory failure can be caused by smoke inhalation, opiate drug overdose, and chronic obstructive pulmonary disease (COPD). However, hypothyroidism would not cause hypercapnic respiratory failure.
Step-by-step explanation:
Hypercapnic respiratory failure is characterized by abnormally elevated blood levels of CO2. Factors that can cause hypercapnic respiratory failure include smoke inhalation, opiate drug overdose, and chronic obstructive pulmonary disease (COPD). However, hypothyroidism would not tend to cause hypercapnic respiratory failure.