E cigarettes contain hazardous substances, addictive and harmful E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center How have e cigarettes changed over time? To Vape or Not to Vape: The Truth About E cigarettes Lions Talk Science E Cigarette vs. Traditional Cigarette: Health Risks, Research Gaps, and Counseling Considerations