Final answer:
Obesity is a known risk factor for difficult tracheal extubation due to excess neck adipose tissue causing airway narrowing, unlike the other listed options such as young age, male gender, or being a non-smoker.
Step-by-step explanation:
The question concerns the patient risk factors for difficult tracheal extubation, which is a medical procedure. Among the listed options, obesity is a known risk factor for complications during tracheal extubation. Obesity can lead to difficult tracheal extubation due to the excess adipose tissue in the neck region, which can push the soft tissues towards the lumen of the airway, resulting in a narrowed trachea and potential airway obstruction. Other factors that can influence tracheal extubation include hypertension and diabetes, but these are not listed among the options provided. Additionally, poor nutrition, lack of physical activity, and smoking can also be considered risk factors, but in the context of this question, non-smoker is not a risk factor for difficult extubation.