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using suitable exposure and outcome definitions

"Smoking has been around too long, and the industries that profit from it are huge and will fight to the end," Caplan said

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Ethics declarations Ethics Approval The survey protocols and all materials, including the survey questionnaires, were approved by the Research Ethics Board at the University of Waterloo, Canada (REB#20803/30570 and REB#21609/30878), Kings College London, UK (RESCM-17/182240), Cancer Council Victoria, Australia (HREC1603), University of Queensland, Australia (20160000330/HREC1603), and Medical University of South Carolina, USA (waived due to minimal risk)