Carbon Monoxide in the Expired Air and Urinary Cotinine Levels of e-Cigarette Users

1. Department of Public Health, Hacettepe University School of Medicine, Ankara, Turkey

2. Department of Pharmaceutical Toxicology, Hacettepe University Faculty of Pharmacy, Ankara, Turkey

3. Department of Preventive Oncology, Hacettepe University Cancer Institute, Ankara, Turkey