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Source1

{
  "resourceType": "Observation",
  "id": "observation-tobacco-use-duration-example",
  "meta": {
    "profile": [
      "https://hl7.lt/fhir/lifestyle/StructureDefinition/tobacco-use-duration-lt-lifestyle"
    ]
  },
  "language": "en",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "status": "final",
  "category": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/observation-category",
          "code": "social-history",
          "display": "Social History"
        }
      ]
    }
  ],
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "88029-4",
        "display": "Tobacco use duration"
      }
    ]
  },
  "subject": {
    "reference": "Patient/patient-male-example"
  },
  "effectiveDateTime": "2025-10-01T09:00:00Z",
  "valueQuantity": {
    "value": 5,
    "unit": "years",
    "system": "http://unitsofmeasure.org",
    "code": "a"
  },
  "note": [
    {
      "text": "Patient reports smoking approximately for 5 years."
    }
  ]
}