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To avoid randomized non-starters and potential bias due to differential early attrition from prior knowledge of group assignment, randomization will occur at the time of visit 0 when participants first receive tobacco products specific to their assigned condition, and neither the research assistant nor participant will know the assignment in advance

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A federal court in 2006 found that several major tobacco companies had violated civil racketeering laws following decades of lying to the public about the health threats of smoking

Shields list of celebrity subjects makes his photography notably eye-catching