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The most carcinogenic compounds among the tobacco-specific nitrosamines, based on extensive laboratory testing in animals, are N -nitrosonornicotine (NNN) and 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK), and these are considered carcinogenic to humans by the International Agency for Research on Cancer (IARC, 2007)

However, prior to the enactment of the National Minimum Drinking Age Act of 1984, the legal age at which alcohol could be purchased varied from state to state (CDC, Minimum drinking age, n

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It is combustion that causes the production of many h armful chemicals detected in cigarette smoke