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The same arguments apply to e-cigarettes battery-powered devices that look like cigarettes, and release a nicotine vapour without any of the accompanying carcinogens

His lung cancer was as "big as a grapefruit" when it was discovered, Duncan says

That can be a very good thing if we have mostly healthy habits

Anti-smoking lobbyists say Montana is targeted because Big Tobacco worried similar taxes would pass elsewhere if the measure passed in a state with cowboys and wide open spaces just like "Marlboro Country." (AP Photo/Bobby Caina Calvan)

We found exactly what we thought we would find in relation to tobacco exposure: a consistent loss of lung function with increasing exposure, said the papers lead author, Mark Pletcher, MD, MPH, associate professor in the Division of Clinical Epidemiology at UCSF