human
I've heard a lot of people talk about the dangers of e-cigarettes. What are the dangers?
assistant
The primary danger is that they contain nicotine, which is highly addictive and can be harmful to health if used in excess. They also may not be as effective at helping smokers quit as other methods, such as patches or gum. Additionally, there is concern that they could lead to nicotine addiction in children and teenagers who would otherwise not have access to cigarettes.