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Abstract Cigarette smoking has been linked to health challenges of global concern. This study determined Body Mass Index (BMI), serum cotinine and C-reactive protein levels of smokers. Forty-five smokers and forty-five aged-matched non-smokers were recruited into the study. Informed consents were obtained from the participants. Ethical consideration was granted by Cross River State Ministry of Health. Blood samples were collected by standard phlebotomy. Smokers were categorized based on Smoking Pack Years (SPY) into light, moderate and heavy smokers. Serum cotinine and C-reactive protein levels were determined by spectrophotometry. Height and weights were measured and BMI calculated. The data were analyzed using SPSS version 23.0. Student’s t-test, ANOVA, Pearson’s correlation were utilized for comparison, results were considered significant at p<0.05. There was no significant difference (p=0.103) between the mean age of smokers and non-smokers. Mean BMI of smokers was significantly lower (p=0.015) than that of non-smokers. Mean Serum cotinine and C-reactive protein of smokers were significantly higher (p=0.001) than those of non-smokers. Mean age, serum cotinine and C-reactive protein levels vary significantly (p<0.05) among the smokers categorized based on SPY. BMI did not vary significantly (p=0.269) among the groups. A correlation between age and serum cotinine was negative (r=-0.359, p=0.016), and that between age and SPY was negative (r=-0.348, p=0.019). Correlations between cotinine and C-reactive protein and between cotinine and SPY were positive (r=0.928, p=0.001) and (r=0.947, p=0.001) respectively. A correlation between C-reactive protein and SPY was positive (r=0.957, p=0.001). The study had shown that C-reactive protein increases with cotinine levels and smoking pack years in smokers.