Introduction:
Smoking and obesity are independent risk factors contributing to the global burden of NCDs which are major causes of morbidity and mortality. Smoking and obesity strongly and independently related with lung function. To date, it is unclear about the combined effects of obesity and smoking on lung function.

Objectives:
To compare the effects of abdominal obesity, smoking, and the combined of abdominal obesity and smoking on lung function.

Methods:
Forty men aged 20-40 years were classified into four groups: control, abdominal obesity, smoking, and abdominal obesity plus smoking groups. Lung function were evaluated by spirometry and compared between groups.

Results:
Abdominal obesity plus smoking group evidenced the lowest levels of both lung function including FEV1 and FVC followed by smoking group and abdominal obesity group, relative to the control group (p<0.05).

Conclusion(s):
The combination of abdominal obesity and smoking showed greater deterioration in lung function (FEV1 and FVC) relative to abdominal obesity or smoking alone, and this is further to develop the risk of respiratory-related non-communicable diseases. Thus, an early prevention, and management in individuals who are abdominal obesity and smoking should be given priority concern.