Smoking after wisdom tooth extraction may lead to complications such as blood clot dislodgement and post-extraction infection, as follows. 1. Dislodgment of blood clot: Smoking action may cause negative pressure in the oral cavity, resulting in dislodgment of blood clot, causing the exposure of the nerve endings of the alveolar bone wall to reactive pain, bleeding, and the alveolar bone wall occurs in many small necrosis of the alveolar bone wall to appear as a dry socket and so on. 2. Post-extraction infection: Smoking will lead to tar deposition in the oral cavity, which will stimulate the extraction wound and cause chronic infection of the extraction wound, which may cause discomfort, poor wound healing, congestion, and purulent secretion. If the above symptoms occur, it is recommended to go to the hospital in time to receive professional treatment as soon as possible.