Users’ Modifications to Electronic Nicotine Delivery Systems: Content Analysis of YouTube Video Comments

Yachao Li   ^{1, 2} , PhD ;   David L Ashley   ³ , PhD ;   Lucy Popova   ³ , PhD

¹ Department of Communication Studies, The College of New Jersey, Ewing, NJ, United States

² Department of Public Health, The College of New Jersey, Ewing, NJ, United States

³ School of Public Health, Georgia State University, Atlanta, GA, United States