Final answer:
Malcolm likely has sleep apnea, a condition marked by breathing interruptions during sleep, often associated with snoring, obesity, and smoking.
Step-by-step explanation:
Given Malcolm's symptoms, which include a history of heavy smoking, snoring, and observed pauses in breathing during sleep, the respiratory condition he likely has is sleep apnea. Sleep apnea is a disorder characterized by pauses in breathing during sleep, which can last several seconds or minutes, and is often due to a physical blockage of airflow.
Factors such as being overweight, smoking, older age, and snoring are associated with an increased risk of sleep apnea. Treatment is important due to potential health risks, including high blood pressure, heart problems, and daytime fatigue.