human
I've heard a lot about the dangers of e-cigarettes. Is there any evidence that they're safe?
assistant
The short answer is that we don’t know yet. There have been many studies on the safety and effectiveness of e-cigarettes, but none has definitively shown either harm or benefit. It's important to note that some of the research suggests that while e-cigarettes may be less harmful than traditional cigarettes, they are not necessarily harmless.