penn state electronic cigarette dependence index Development and initial validation of a new self-report measure to assess perceived on tobacco and nicotine products Center for Research on Tobacco
Center for Research on Tobacco and Health College of Medicine Penn State The Roswell eND scale: Brief, valid assessment of nicotine dependence adults seeking to discontinue e cigarette use ScienceDirect Popular electronic cigarette may deliver nicotine more effectively than others, researchers say Penn State Health News Full article: Disposable electronic cigarettes chemical composition and health effects of their use. A systematic review
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