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"Cigarette smoking is something most people already understand in a tangible way - we know roughly what a pack a day does to a person's health," Tan said

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Compared with current cigarette-only smokers, current exclusive e-cigarette users had lower adjusted odds of hypertension (OR 0.81, 95% CI 0.660.99, p = 0.045), whereas current dual users did not differ (OR 1.01, 95% CI 0.791.29, p = 0.957)

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Dividing this by 1.5 million Philadelphians equals a per capita rate of 43 packs per year per person