Fig. 3.

Differences of IL-4 and IL-10 levels by negative and positive lipid-laden macrophages (>10 LLM index) in never-smokers, e-cig users, and smokers in bronchoalveolar lavage fluids. Each dot represents individual never-smokers (blue), e-cig users (green), and smokers (red). The open circles indicate never-smoking e-cig users (smoked<100 cigarettes in their lifetime). Box plots show medians with interquartile range. Mann-Whitney was used for pairwise analyses between negative and positive LLM.