It takes at least 3-6 months to quit smoking before you can get pregnant. 3 months to quit smoking is for women who have been smoking for a short period of time, while women who have been smoking for a long period of time can quit smoking for at least half a year before they can get pregnant. Because tobacco is more harmful to the human body, tobacco contains a large number of carcinogenic substances, which can lead to cell cancer and malignant tumors. The nicotine in tobacco is a vasoconstrictor, and if a woman becomes pregnant too early, the nicotine in her blood will not be metabolized, causing vasoconstriction at the base of the placenta, increasing the chances of miscarriage and causing birth defects and complications during pregnancy. So it takes at least 3-6 months to quit smoking before you can get pregnant, and a healthy medical checkup before you get pregnant, so you can prepare for pregnancy.