This is the ValueSet that contains all the codes in ObservationStatus (http://hl7.org/fhir/ValueSet/observation-status) and US Core Tobacco And Nicotine Observation Status (http://hl7.org/fhir/us/core/ValueSet/us-core-observation-smoking-status-status). E.g. what you have to deal with if you get resources containing codes in either of them