As little as 30 minutes exposure to secondhand smoke could cause blood vessel damage.

Those who do not smoke can suffer impaired blood vessel function with as little as 30 minutes of exposure to secondhand smoke. Researchers used concentrations similar to those encountered in real-life circumstances. This study reinforces the danger smokers pose to other people, let alone their own health.

PositiveTip: Support efforts to ban smoking in all public places--and avoid inhaling some one else's smoke.

Observational data suggests chocolate may protect cardiovascular system.

A meta-analysis of seven observational studies with 115,000 adult participants compared the lowest level of chocolate consumption with the highest intakes. Those eating the most had nearly a one-third decrease in risk for cardiovascular disease and stroke. The authors caution that most forms of chocolate contain high amounts of fat and sugar, and more esperimental research is necessary to prove causation.

PositiveTip: Think twice before you indulge in your favorite chocolates "for your hearts sake". Most forms of these products are very high in calories!