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In their study, the levels of major carbonyls for HTPs were, on average, 91.6% lower for formaldehyde, 84.9% lower for acetaldehyde, 90.6% lower for acrolein, 89.0% lower for propionaldehyde and 95.3% lower for crotonaldehyde, compared to cigarettes [66]

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These two city policies did exactly what they were designed to do, says study corresponding and senior author Justin White, associate professor of health law, policy & management at BUSPH