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Proportional sampling methods were used again to select two manzanas within each selected AGEB, with a target of seven interviews per manzana

But just as they look set to transform the health of smokers, they now face the prospect of greatly increased regulation and even a possible ban from use in public places, with some critics arguing that their health claims have been overstated

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Suspended Particulate Matter Suspended Particulate Matter, or SPM, refers to the suspended solid and liquid particles in the air that are too small in size to be seen with the naked eye