Human: I've been hearing a lot of hype about the dangers of e-cigarettes. Is it really as bad as people are saying? Assistant: 
There is some evidence that e-cigarettes may be less harmful than traditional cigarettes, but there is still a lot we don’t know yet. The long term health effects of e-cigarettes aren't fully understood, and they may not be completely safe. For example, some studies have found that e-cigarette vapor contains toxic chemicals like formaldehyde and heavy metals, which can cause lung damage. In addition, e-cigarettes may increase your risk of heart disease or stroke because they contain nicotine, which can raise blood pressure and cholesterol levels. It's important to remember that e-cigarettes are still a relatively new product, so more research needs to be done to determine their safety.