Nicotine dependence, motivations, and intention to quit smoking among smoking cessation outpatients: A cross sectional study The Demographics of E Cigarette Users [Part 1 of 3 Part Series] Frontiers Nicotine dependence is associated with an increased risk of developing chronic, non communicable inflammatory disease: a large scale retrospective cohort study Vaping Percentages UW CTRI UWMadison Landing Percent of adults who currently use e cigarettes some days or every day by Total State Health Access Data Assistance Center Penn State Electronic Cigarette Dependence Index