Table 1. Experimental subject description - healthy non-smokers and smokers.

Age range (years)	Number of Samples (codes)
	Healthy males	Healthy females	Smokers
20–30	20 (HMPG1 1–20)	20 (HFPG1 1–20)	33 (SMPG1-1–33)
30–40	10 (HMPG2 1–10)	10 (HFPG2 1–10)	19 (SMPG2-1–19)
40–50	10 (HMPG3 1–10)	10 (HFPG3 1–10)	24 (SMPG3-1–24)
Above 50	10 (HMPG4 1–10)	10 (HFPG4 1–10)	24 (SMPG4-1–24)