Two squares of Dark Chocolate a day could keep the doctor away.

Dark Chocolate – Most effective Medicine for coughs
An ingredient of chocolate, theobromine, could potentially put a stop to persistent coughs and lead to new effective cough medicines.
Researchers at the Imperial College, London, found that chocolate is nearly a third more effective in stopping persistent coughs than the leading medicine codeine. They say it has fewer side effects than the conventional treatments - and does not leave people drowsy.
Theobromine works by suppressing vagus nerve activity, which is responsible for causing us to cough.

Dark chocolate may be healthier than milk chocolate
Researchers in Italy and Scotland Italy have stated that dark chocolate has much better anti-oxidant properties than milk chocolate. Meaning that it can protect the heart and arteries from oxidative damage, akin to rusting that develops on metal over time. Writing in the Nature journal, they said adding milk to chocolate may cancel out these health benefits. Previous studies have suggested that chocolate may help to protect against heart disease and possibly cancer.

Dark Chocolate May Protect Smokers' Hearts
According to a small Swiss study, eating small quantities of dark chocolate can improve smokers' artery function within hours. A few squares a day may also reduce the risk of hardening of the arteries.
The researchers gave twenty male smokers about 1.4 ounces of either dark or white chocolate. In just two hours the dark chocolate significantly improved the function of endothelial cells, which line the artery walls, and reduced the activity of platelets, which help form blood clots. It is known that smoking disrupts the function of both types of cells, often leading to hardening of the arteries and heart disease.

The protective effects of dark chocolate lasted about eight hours. But there's always the risk of too much of a good thing. The researchers note that too much chocolate could increase the risk of heart disease by raising blood-sugar levels, body fat and body weight. But their findings suggest just a couple ounces of dark chocolate a day may reduce the risk of coronary artery disease. The study's authors say that this positive effect is probably due to the fact that dark chocolate is so rich in antioxidants. The study did not examine the effects of chocolate in nonsmokers. And this of course shouldn't be considered a substitute for the safer treatment: quitting smoking altogether.