Humidified Forest Oils for Immune System Recovery in Stage I-III Breast or Prostate Cancer

Inclusion Criteria: * Age \>= 18 years. Both men and women and members of all races and ethnic groups will be included * Participants must have histologically or cytologically confirmed breast cancer or prostate cancer (hormone therapy excepted) who are in stage I-V with or without evidence of metastasis using the Cancer Therapy Evaluation Program (CTEP) Simplified Disease Classification * Participants must be within 12 months of their first diagnosis of breast or prostate cancer * Criteria for solid tumors: Participants must have measurable disease, per doctor of medicine (MD) and data in medical record * Participants must have no history of autoimmune disease * Ability to understand and the willingness to sign a written informed consent document Exclusion Criteria: * If they have asthma. Rationale: forest oils may be a possible trigger for asthma * If they have a known allergy to citrus peel or pine forests. Rationale: forest oils may cause contact dermatitis and coughing * If they are unable to detect common odors from commercial fragrances. Rationale, forest oils are humidified as an aroma to be inhaled in the simulate the forest greenspace immersion (SFIT) * First diagnosis of breast or prostate cancer is longer than 12 months ago. Rationale, NK cell number recovery may be complete by this time after first treatment * Febrile illness/infection within previous two weeks. Rationale, immune biomarkers will reflect previous febrile illness * Current tobacco or tobacco use…