Dual use of e-cigarettes with conventional tobacco is associated

Heart attack risk doubles for daily e-cigarette users

E-Cigarettes Expose People to More Than 'Harmless' Water Vapor

Japan to investigate e-cigarette safety after formaldehyde findings, Vaping

Electronic cigarettes use and 'dual use' among the youth in 75 countries: estimates from Global Youth Tobacco Surveys (2014–2019)

Patterns and trends of dual use of e-cigarettes and cigarettes among U.S. adults, 2015–2018 - ScienceDirect

How Indonesian Youth Are Being Hooked On E-Cigarettes Through Social Media

Patterns and trends of dual use of e-cigarettes and cigarettes among U.S. adults, 2015–2018 - ScienceDirect

Dual use of e-cigarettes with conventional tobacco is associated with increased sleep latency in cross-sectional Study

Frontiers Chronic E-Cigarette Aerosol Inhalation Alters the Immune State of the Lungs and Increases ACE2 Expression, Raising Concern for Altered Response and Susceptibility to SARS-CoV-2

Electronic Cigarette Use Prevalence, Associated Factors, and Pattern by Cigarette Smoking Status in the United States From NHANES (National Health and Nutrition Examination Survey) 2013–2014