Maintained Smoking Cessation for 6 Months Equilibrates the Percentage of Sputum CD𝟖⁺ Lymphocyte Cells with That of Nonsmokers

Figure 3

Percentage of sputum CD4⁺ T-cells (% sputum lymphocytes) in “healthy” smokers before smoking cessation (𝑛 = 16), after 6 months of smoking cessation (𝑛 = 18), and after 1 year of smoking cessation (𝑛 = 9). Results from 10 never-smokers (controls) are also presented.