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But when DNA with an adduct is replicated, the enzymes that do the copying tend to put an adenine base opposite this guanine, rather than the usual cytosine

That cost far outweighs global revenues from tobacco taxes, which the WHO estimated at about $269 billion in 2013-2014

Stress can come from many sources, including emotional events, workplace pressures, and significant life changes

By contrast, relief of withdrawal-related attentional deficits and cigarette ratings depend on nicotine dose regardless of metabolizer status

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