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Observational studies of exposure to tobacco and nicotine products: Best practices for maximizing statistical precision and accuracy ScienceDirect Effectiveness and Adherence of Pharmacological vs. Non Pharmacological Technology Supported Smoking Cessation Interventions: An Umbrella Review Center for Research on Tobacco and Health College of Medicine Penn State Frontiers Safety and efficacy of CyTisine for smoking cessation in a hOSPital context (CITOSP): study protocol for a prospective observational study Biochemical Verification of Tobacco Use and Abstinence: 2019 Update PMC
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