The hazards of long-term sniffing of essential oils by children include affecting the children’s olfactory system and increasing the incidence of allergic rhinitis. Essential oils contain some alcohol and other volatile substances, which are generally irritating to children. Children’s body functions are not well developed, so when children smell essential oils for a long time, it may have an impact on their olfactory system, which may cause a decrease in the sensitivity of their sense of smell, or even a loss of olfactory function. In addition, the volatile substances of essential oils can irritate the nasal cavity and other parts of the child, leading to an increase in the probability of children suffering from allergic rhinitis. At the same time, volatile substances can also stimulate children’s airways, which may lead to allergic coughing if the child’s constitution is sensitive. Therefore, it is recommended that children should not be allowed to smell essential oils for a long period of time. If children experience any discomfort after exposure to essential oils, it is recommended that they seek medical attention as soon as possible for targeted treatment.