Table 3.

Association between cigarette smoking and opium usage in the two groups under study.

	CVD+		CVD−
	Opium+	Opium−	Opium+	Opium−
Smoking+	22	2	8	4
Smoking−	12	22	1	20
	OR=20.2, 95%CI=4−100.9		OR=40, 95%CI=3.8−415