Marigold oil is also known as cooling oil, which may cause adverse effects when pregnant women sniff it. Cool oil is a proprietary Chinese medicine, the main ingredients of which are menthol, menthol oil, camphor, eucalyptus oil, clove oil, cinnamon oil, camphor oil and so on. It is mainly used for the treatment of colds and headaches, heat stroke, motion sickness, mosquito bites and so on. If a pregnant woman smells the cool oil once in a while, it usually does not cause great harm, but do not often smell the cool oil. Because the camphor and other substances contained in the cool oil can be absorbed through the skin or mucous membranes, through the placental barrier effect on the fetus, affecting its normal development, in serious cases may lead to teratogenicity, stillbirth, miscarriage, etc., so pregnant women should try to avoid sniffing cool oil. Pregnant women who are only slightly unwell are usually not advised to use drugs directly, because most drugs may affect the fetus, so it is best to reduce the unnecessary use of drugs. However, it does not mean that pregnant women absolutely can not use drugs, if the mother itself exists in certain diseases, not actively carry out the treatment of the case, is also not conducive to the growth and development of the fetus. If there are obvious symptoms of discomfort during pregnancy, you should go to the hospital for examination in a timely manner, and take medication at regular intervals according to the doctor’s instructions, and do not blindly use medication on your own, so as to avoid delaying the condition or triggering adverse reactions.