<Observation xmlns="http://hl7.org/fhir">
  <id value="188" />
  <status value="final" />
  <code>
    <coding>
      <system value="http://snomed.info/sct" />
      <code value="77176002" />
      <display value="Smoker" />
    </coding>
  </code>
  <subject>
    <reference value="Patient/1021" />
  </subject>
  <effectiveDateTime value="2018-10-29T12:12:59+01:00" />
  <valueBoolean value="true" />
</Observation>