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Third, we followed previous recommendations that at least 10-15 experiments should be included in an ALE meta-analysis and note that the meta-analysis identifying gray matter decreases among smokers involved 14 studies

NNK: NNK is a tobacco-specific nitrosamine, formed from nicotine, and is one of the most abundant and potent carcinogens in cigarettes and tobacco-related products

But this tension is resolved in part by the nature of the cigarette market

These patients may have acid reflux even when acid levels are normal

Occupational investigations have linked several of these roles to flavorings-related occupational diseases involving permanent small-airway damage