Intersection of http://hl7.org/fhir/ValueSet/observation-codes and http://hl7.org/fhir/us/bfdr/ValueSet/cigarette-smoking-before-during-pregnancy
This is the ValueSet that contains codes in both LOINC Codes (http://hl7.org/fhir/ValueSet/observation-codes) and Cigarette Smoking Before and During Pregnancy (http://hl7.org/fhir/us/bfdr/ValueSet/cigarette-smoking-before-during-pregnancy).