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To help fill that gap, Cleveland Clinic researchers performed a retrospective study looking at the effect of donor smoking status, pack-years or substance use on allograft function and survival after lung transplant

Used by specific brands as a distinctive structural identifier

Primary research encompassed over 55 structured interviews conducted in 2024-2025 with e-cigarette brand managers, vape specialty retail buyers, regulatory affairs directors at tobacco multinationals, ASH (Action on Smoking and Health) policy specialists, FDA Center for Tobacco Products analysts, and equity analysts covering tobacco and alternative nicotine sectors

Nicotine is the main ingredient in cigarette smoke, but it also includes other harmful substances like tar and carbon monoxide