<https://norml.org/blog/category/cat-science/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://norml.org/blog/2013/07/09/study-marijuana-smoking-not-associated-with-airway-cancers-copd-emphysema-or-other-tobacco-related-plumonary-complications/>