Table 1.

Personal history

	Frequency (%)
	Cases	Control
No addiction	159 (67.7)	119 (64.3)
Alcohol	6 (2.6)	5 (2.7)
Smoking	17 (7.2)	10 (5.4)
Tobacco	32 (13.6)	30 (16.2)
Alcohol + tobacco	6 (2.6)	4 (2.2)
Alcohol + smoking	5 (2.1)	7 (3.8)
Smoking + tobacco	10 (4.3)	10 (5.4)
Total	235 (100.0)	185 (100.0)

In the case group 67.7% of the total people have no kind of addiction, 2.6% are chronic alcoholics, 7.2% are chronic smokers, 13.6% are chronic tobacco chewers and 9% people have more than one addictions