How to Clean an E Cigarette eCig One Different types of e cigarettes from the first to fourth generation. Download Scientific Diagram Electronic Nicotine Delivery Systems (ENDS), including e cigarettes and vapes, are often perceived as a safer alternative to traditional tobacco. But is the evidence really supporting this belief? A recent umbrella review published Nicotinism and the Emerging Role of E Cigarettes (With Special Reference to Adolescents). Volume 1: Concepts, Mechanisms, and Clinical Management UK medicines regulator to approve e cigarettes for medical use The Pharmaceutical Journal