Differences in Exposure to Nicotine, Tobacco-Specific Nitrosamines, and Volatile Organic Compounds among Electronic Cigarette Users, Tobacco Smokers, and Dual Users from Three Countries

Danielle M. Smith, Lion Shahab, Benjamin C. Blount, Michal Gawron, Leon Kosminder, Andrzej Sobczak, Baoyun Xia, Connie S. Sosno and Maciej L. Goniewicz