Smoking is not allowed on the first day after extraction, especially when extracting a large traumatized tooth, and it is strongly recommended to abstain from smoking for 24 hours after the surgery, because smoking itself will create a more intense negative pressure environment in the mouth, which is detrimental to the healing of the extraction wound and the stabilization of the blood clot formation. It is recommended that you do not brush your teeth, rinse your mouth, lick the extraction wound with your tongue, or suck hard on the extraction wound for 24 hours after the extraction, and smoking is precisely a method of sucking on the extraction wound. Because of the history of smoking, the oral cavity is a particularly intense negative pressure environment, if you suck too hard, it may cause the extraction trauma blood clot loosening and secondary bleeding. So it’s not necessarily common clinically, but it’s a risk that can be prevented as much as possible.