This study evaluated the co-morbidities of adult smokers at risk of COPD over a 6-year period. The study followed 513 healthy asymptomatic heavy smokers with over 20 years of smoking history and no chronic diseases. After 6 years, 43.1% of smokers suffered from at least one co-morbidity and were taking daily medications. The most common were for metabolic syndrome diseases (20%) and arteriosclerotic diseases (9.7%). Overall, 4% of smokers died during the study, half from cancer and others from arteriosclerosis. The study concludes that adult smokers have a similar risk of developing co-morbidities as COPD patients.