<http://schema.org/about>
"U.S. high school students are unlikely to be heavy smokers, but casual and occasional smoking is on the rise, according to a new study that warns even light smo"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/casual-smoking-rises-among-us-students>