CD4 and HIV infectious disease: Prevalence of high serum cotinine levels was similar across smoking status (current smokers: 28.5%, former smokers: 25.9% and never smokers: 23.1%) (p = 0.564) and did not differ between men and women (p = 0.940), between those above and below median duration of diagnosed HIV infection (p = 0.681) and between those above and below median CD4 count (p = 0.505) (Figure 2).