About: http://webisa.webdatacommons.org/46273335

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Variables such as duration and intensity of tobacco use and level of addiction were not available for all ever users.
http://www.w3.org/ns/prov#wasQuotedFrom	nih.gov