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Inter-study heterogeneity was assessed using the I 2 statistic, where 25, 50, and 75% represented low, moderate, and high heterogeneity, respectively (16)

Bush administration when Congress enacted the Alcohol, Drug Abuse, and Mental Health Administration Reorganization Act, whose Synar Amendment forced states to create their own laws to have a minimum age of 18 to purchase tobacco or else lose funding from the Substance Abuse and Mental Health Services Administration

The least cessation activity occurred in the South, where 31.2 percent of ever smokers had cessation activity in the past year

Most commercial cigarettes are not considered vegan by ethical standards