Aromatherapy harms?

The smelling of essential oils practically doesn't have any contra-indications except the individual psychological immunity.
The external use of essential oils during massages demands the limit of the concentration. During the covering of the body with these oils the reaction to it of skin may be unpredictable. The perception of oils is very individual and there may be allergy. Some oils are toxic and their concentration in perfumery and cosmetics id well-controlled and regulated.
And the internal use of essential oils is very dangerous and should be used only under the control of doctors and such oils should be bought only in drugstores with the advice of pharmacologist.
The use of essential oils during the pregnancy should be controlled and limited especially on the early stages of pregnancy.
The investigations show that aromatherapy doesn't produce any effect on the time of healing and immunity of people despite the supporters of such therapy. On the other hand researchers say that the mathematical abilities of people increase when they feel the light smell. That is why it is necessary to investigate its psychological impact.