<http://schema.org/caption>
"15. Estimates from research suggest that about 9 percent of users become addicted to marijuana; this number increases among those who start young (to about 17 percent) and among daily users (25-50 percent)."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.wgal.com/article/25-facts-about-marijuana/6156022>