Ending New Nicotine Dependencies Act of 2019 or the ENND Act This bill revises requirements for electronic nicotine delivery systems (e.g., e-cigarettes, e-hookah, and vape pens). Specifically, the bill prohibits electronic nicotine delivery systems from containing flavors other than tobacco; sets forth standards on the permissible design of these systems; requires the Department of Health and Human Services (HHS) to report on the public health risks of tobacco use, including a focus on these systems and other alternative tobacco products; subjects these systems to excise tax requirements; and directs HHS to conduct a public awareness campaign to educate the public about the health implications of using these systems.