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For comparison, levels found in cigarette smoke were anywhere from 2.5 to 40 times higher

But because the study only looked at a small number of people, the results are not definitive just two or three patients can skew results, John Ambrose, a cardiologist with the University of California, San Francisco cautions

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External links [edit] Examples of Tobacco Advertising Snuff advertising in the collection of Helmetta Historical Society UCSF Tobacco Industry Videos Collection UCSF Tobacco Industry Audio Recordings Collection Gallery of vintage American tobacco print advertisements Extensive online tobacco advertising collection at Stanford University Cigarette Cards: ABCs, at the New York Public Library Digital Gallery Catalogue of heraldic tobacco and trading cards Duke Tobacco Company Cigarette Cards Archived 19 May 2008 at the Wayback MachineWake Forest University Stanford University research into the impact of tobacco advertising

Slim pack boxes are also worthy of mention, as they are designed around the smaller format of "slim" cigarettes and not a small version of a regular pack