Using e-cigarettes and other tobacco products to keep from relapsing to cigarettes doesn't appear to be effective, according to a new longitudinal study of nearly 13,000 smokers in the United States.

(CNN) — Vaping has an immediate effect on how well the user’s blood vessels work, even if the e-cigarette doesn’t contain nicotine, according to new research. (CNN) — Vaping has an immediate effect on ...