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A more detailed grouping of lifetime tobacco exposure showed a typical dose-response relationship

Toxic metals, including beryllium, cadmium, lead, and polonium-210, are also present in cigarette smoke in measurable quantities, 79,80 levels of which may depend in part on the region of the world where the tobacco was grown

and smoking rates in the Bronx, Manhattan and Queens fell by more than 20 percent

Strictly speaking, the tests often look for cotinine and not nicotine because cotinine is more stable and lasts longer in the body, and is only present after nicotine is broken down (4)

Quality assurance considerations involve supplier audit reports, material traceability, and batch testing protocols