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  1. Cedar leaf oil poisoning 
    https://medlineplus.gov/ency/article/002769.htm
    Cedar leaf oil is made from some types of cedar trees. Cedar leaf oil poisoning occurs when someone swallows this substance. Young ... The substance in cedar leaf oil that can be harmful is thujone (a hydrocarbon).
  2. Excluded Studies - Assessment and Management of Chronic Cough - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK116697
    ... airway hyperresponsiveness in non-asthmatic patients with Japanese cedar pollinosis. Allergol Int. 2009; 58 (2):277–87. [ ...