Smoking all the time when pregnant has more harms, such as high blood pressure, fetal malformation, miscarriage and other harms, need to be analyzed specifically. 1. Hypertension: Smoking is a high-risk factor for high blood pressure, and if you continue to smoke when you are pregnant, it may also cause gestational hypertension, which can lead to dizziness and other symptoms in pregnant women, as well as fetal deformities and other conditions. 2. Fetal malformation: When smoking, harmful substances will enter the placental barrier through the bloodstream, which will affect the growth and development of the fetus, leading to fetal malformation. 3. Miscarriage: Long-term smoking will cause continuous stimulation to the fetus, and when the fetus cannot withstand this unfavorable intrauterine environment, it will lead to miscarriage. Smoking all the time during pregnancy is harmful to the mother as well as the fetus. It is recommended to stop smoking during pregnancy and change bad habits to promote personal health and normal development of the embryo.