
Smoke from e-cigarettes damages DNA and can increase the risk of cancer and heart disease, scientists have warned.
The battery-driven devices, which deliver an instant nicotine "hit" without burning tobacco, have been widely promoted as a safer alternative to cigarettes.
But findings from a new study suggest they are far from harmless, and could pose a serious health risk.
In laboratory tests, mice exposed to e-cigarette smoke had higher levels of DNA damage in the heart, lungs and bladder than those breathing normal filtered air.