Risk and Protective Factors of COPD Among Smokers: A Cross-Sectional Study Using NHANES Database

CONCLUSION: The findings of our study suggest that smokers who are older, have a lower BMI, and comorbid asthma are at an increased risk of developing COPD. Conversely, higher consumption of fruits and vegetables, as well as increased intake of vitamin C, may help reduce this risk. Additionally, our results indicate that among smokers with lower fruit and vegetable intake, COPD patients tend to have lower levels of vitamin C consumption.