What causes irregular menstruation? Is irregular menstruation related to smoking?

Irregular menstruation not only threatens everyone's health, but also causes mental torture to everyone, so everyone must correctly understand and recognize this disease. The following is an analysis of the causes of irregular menstruation by experts. Smoking is an important factor in irregular menstruation and early pregnancy. The phenylpropene in cigarettes is a lethal factor for oocytes. Animal experiments have shown that a small dose of phenylpropene can destroy 25% of oocytes, and a large dose of phenylpropene can destroy 98% of oocytes. Surveys show that smokers enter the irregular menstruation period 54 times earlier than non-smokers on average. The combined effects of irregular menstruation cause some women to have abnormal psychological and physical changes, which is called irregular menstruation.