The investigator wish to provide a blend of two essential oils with comparable antiemetic properties; Peppermint essential oil (Mentha x Piperita) and lemon tree essential oil (Citrus Limon). Dry inhalation of these essential oils is safe, but effectiveness has not been determined. Studies on the subject present a questionable methodology. This is why we are proposing this study to measure the effectiveness of this mixture of essential oils on chemo-induced nausea and vomiting.

This study is a first step before a possible study to compare the effects of essential oils with those of a placebo.

Inclusion Criteria:

Patients will be eligible if:

• Aged over 18,
• Presenting a solid tumor in the 1st line of chemotherapy administered by intravenous route;
• Treated with adjuvant or neoadjuvant chemotherapy;
• Affiliated with a social security scheme;
• Able to understand the meaning of the questions asked;
• Having given their written consent to participate in the study;
• Whether or not treated with surgery and radiotherapy before entering the study

Exclusion Criteria:

Patients who:

• Do not give their consent to participate;
• Do not master the French language;
• Are deprived of their liberty, under guardianship or curatorship;
• Suffer from cognitive deficits or associated psychiatric disorders that could compromise their ability to participate in the study (eg: schizophrenia);
• Are undergoing radiotherapy;
• Must receive a combination of radio-chemotherapy;
• Whose chemotherapy protocol is composed of several chemotherapy administrations per week during a course of treatment;
• have been previously treated with chemotherapy;
• Have an occlusive syndrome;
• Have primary cancer of the central nervous system or brain metastases;
• Have cancer of the Upper Aero Digestive Tract;
• Simultaneously participate in a therapeutic clinical trial;
• Have an intolerance to a component of essential oils;
• Pregnant or breastfeeding.