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Differences in this tube size affect the amount of tar delivered, as measured by a smoking machine

50 nm Only a minority fraction has a size of about 200 nm

LONDON - Tobacco will kill nearly six million people this year, including 600,000 non-smokers, because governments are not doing enough to persuade people to quit or protect others from second-hand smoke, the World Health Organization (WHO) said on Tuesday.Since there is often a lag of many years between when people start smoking and when it affects health, the epidemic of tobacco-related disease and death has just begun, the WHO said

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It also increases the risk that a federally-mandated ban on menthol cigarettes would be implemented, she added.

Ross is a News Editor at MSNBC.com