You already know that I am ferociously anti-smoking, but if this doesn’t change your mind about even that one cigarette you might consider having, I don’t know what will. Take a look: “ Just One Cigarette Can Harm DNA ”
Every exposure to tobacco, from occasional smoking or secondhand smoke, can damage DNA in ways that lead to cancer. “Tobacco smoke damages almost every organ in your body," says Surgeon General Regina Benjamin. In someone with underlying heart disease, she says, "One cigarette can cause a heart attack.”
About 40 million Americans smoke — 20% of adults and older teens. Tobacco kills more than 443,000 a year, says the 700-page report, written with contributions from 64 experts.