Effect of an electronic nicotine delivery system with 0, 8, or 36 mg/mL liquid nicotine versus a cigarette substitute on tobacco-related toxicant exposure: a four-arm, parallel-group, randomised, controlled trial

Caroline O. Cobb, Jonathan Foulds, Miao-Shan Yen, Susan Veldheer, Alexa A. Lopez, Jessica Yingst, Chris Bullen, Le Kang, Thomas Eissenberg, Sophia I. Allen, Phoebe Brosnan, Chris Bullen, Nadia Chowdhury, Caroline O. Cobb, Thomas Eissenberg, Jonathan Foulds, Jacob T. Graham, Erin Hammett, Sharilee Hrabovsky, Breianna Hummer, Le Kang, Courtney Lester, Alexa A. Lopez, John P. Richie, Christopher Sciamanna, Shumei S. Sun, Thokozeni Lipato, Susan Veldheer, Miao-Shan Yen, Jessica Yingst