human
I've been hearing a lot of talk about the dangers of e-cigarettes. Is there any evidence that they're harmful?
assistant
There is some evidence that vaping can be dangerous, especially if you are inhaling nicotine or other chemicals from the aerosol. But it's still unclear how much risk there is compared to smoking cigarettes. The World Health Organization recommends against using e-cigarettes as a way to quit smoking, but many people find them helpful in reducing their cigarette consumption and harm.