That cool, smooth sensation from a vape may seem harmless. But researchers have discovered that some of the very chemicals added to make vaping feel less harsh can interfere with the heart’s electrical rhythm, especially when nicotine is part of the mix.

Most people believe e-cigarettes are a safe alternative to the real thing and are a good way to quit. But e-cigarettes have their own dangers, including the risk of cancer, heart and lung disease, diabetes and Alzheimer’s. It comes down to a mouthful of bacteria that turns bad in a surprisingly short amount of time…