Among the 7,000 or so different chemicals in cigarette smoke, more than 70 are known to be carcinogens. Most carcinogens promote cancer by damaging DNA and causing mutations. Illustration by Wenjing ...

E-cigarettes are increasingly being used as a nicotine alternative as smokers seek ways to kick their habit. They work by heating a pure liquid called e-juice -- composed of flavorings, propylene ...

Smoking or living with cigarette smoke can accelerate age-related degeneration of the eyes, researchers from Johns Hopkins Medicine found, and it hurts young eyes more.