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See additional terms and conditions for Chegg Study or Chegg Study Pack on Chegg.com Show transcribed image text Question: Lung Cancer & Smoking Case Study A causal relationship between cigarette smoking and lung cancer was first suspected in the 1920s on the basis of clinical observations

Jonathan Foulds is a tobacco dependency specialist at Penn State University

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"The ads we found from Blu in 2017 had these fake warnings at the top that really adhered to the warning messages requirements that are now required on e-cigarette ads by the FDA," says Brittney Keller-Hamilton, the study's lead and a researcher at Ohio State University's College of Public Health