<http://schema.org/caption>
"13. A similar challenge arises in studies of the effects of chronic marijuana use on brain function. Brain imaging studies in chronic users tend to show some consistent alterations, but their connection to impaired cognitive functioning is far from clear. This uncertainty may stem from confounding factors such as other drug use, residual drug effects, or withdrawal symptoms in long-term chronic users."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.wgal.com/article/25-facts-about-marijuana/6156022>