Mercury promotes blood clots, which increases heart disease risk.
http://www.environmentalhealthnews.org/ehs/newscience/mercury-promotes-blood-clots-increases-heart-disease-risk/
http://www.environmentalhealthnews.org/ehs/newscience/mercury-promotes-blood-clots-increases-heart-disease-risk/
"A research team describes the likely way mercury affects red blood cells and increases the risk of heart disease."