And University of California San Diego researcher John Pierce says heavy smoking rates dropped more in California than in other states.
加州大学圣地亚哥分校的研究员约翰·皮尔斯说,加州老烟枪比率的下降,比其它各州都快。
And University of California San Diego researcher John Pierce says heavy smoking rates dropped more in California than in other states.
加州大学圣地亚哥分校的研究员约翰·皮尔斯说,加州老烟枪比率的下降,比其它各州都快。
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