Table 5 Predictors of health knowledge (n = 9058).

	Adjusted odds* (95% CI) of believing smoking causes….
	Heart disease	Stroke	Impotence	Lung cancer (smokers)	Lung cancer (non‐smokers)
Country
CAN (reference)	1.00	1.00	1.00	1.00	1.00
USA	0.72 (0.59 to 0.89)	0.64 (0.55 to 0.75)	0.35 (0.31 to 0.40)	1.09 (0.81 to 1.48)	0.60 (0.52 to 0.70)
UK	0.95 (0.77 to 1.18)	0.51 (0.44 to 0.59)	0.41 (0.36 to 0.47)	0.98 (0.74 to 1.31)	0.84 (0.72 to 0.98)
AUS	0.82 (0.66 to 1.01)	0.90 (0.77 to 1.06)	0.37 (0.33 to 0.42)	0.90 (0.68 to 1.19)	0.55 (0.47 to 0.64)
Noticing anti‐smoking information	1.20 (1.04 to 1.39)	1.16 (1.04 to 1.36)	1.05 (0.96 to 1.15)	1.10 (0.90 to 1.34)	1.11 (1.15 to 1.41)
Noticing warning labels	1.20 (1.04 to 1.38)	1.23 (1.11 to 1.26)	1.14 (1.05 to 1.24)	1.31 (1.08 to 1.61)	1.27 (1.15 to 1.41)

* Odds of believing smoking causes disease (0: No/Don't know, 1: Yes).

Odds ratios are adjusted for age, sex, income, ethnicity, and cigarettes smoked per day.

CI, confidence interval.