The increase in dual use was statistically significant among those with low education (OR 1.4, 95% CI 1.25–1.50), nearly significant among middle educated (OR 1.1, 95% CI 0.998–1.13) but not among highly educated (OR 0.96, 95% CI 0.86–1.07).
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Changing patterns of tobacco use in a middle-aged population: the role of snus, gender, age, and education.
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