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Circulation 87 , 14271428 (1993)

Cigarettes and cigarette smoke contain many chemicals that can damage the blood vessels and heart

As for the medicines that contain cannabis, they are also yet to be fully studied, however, they seem to be relatively safe

For example, the oncogenic actions of marijuana are proven to be lower than those of tobacco, but the heart suffers more when people smoke weed

Image: Eva Spure/Getty Images About the Author Julie Corliss, Executive Editor, Harvard Heart Letter About the Reviewer Christopher P