highly significantp < 0.01
Similar finding supported our current study were reported by García et al (2013) as eGFR was highly significant decrease in heavy smokers; relative to other groups; with highly substantial statistical difference (p < 0.01), which came in agreement with our results and with results reported by Obert et al (2011). 24 , 25 Exposure to passive smoking has been reported to be associated with a higher risk of several types of malignancies and cardiovascular diseases.