Comparing Different Types of Ecigs and Vapes Reasons for continued usage of ENDS: Differences by device and liquid characteristics among US adults From cigarettes to e cigarettes: The evolution of tobacco use in the United States 4 H Healthy Youth Smoking Out E Cigarettes The Regulatory Review Analysis suggests e cigarette use may be linked to lower rates of smoking E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA