Table 2.

Toxic elements levels in pipe smokers human blood (μg/L).

No.	Smo- King∗	Age∗∗	Cd	Pb	Hg	Se	Mn	Zn	Cr	Ni
1	14/1	2	0.7	21.7	BDL	17.9	5.3	3475.5	172.5	6.0
2	25/5	2	3.6	42.8	9.0	47.4	9.0	5004.0	238.5	13.0
3	8/1	1	BDL	17.0	BDL	23.6	0.4	3987.3	183.2	10.6
4	4/1	1	BDL	18.8	5.7	32.5	33.7	2780.4	172.9	9.1

^∗ Smoking; period of smoking (y)/rate of smoking (number of pipes per day),

^∗∗ Age; 1= ≤25, 2= 26-40 y.