Smoking is not recommended for patients after thyroid surgery. If the wound has not healed yet, smoking may cause secondary infections in the surgical wound, resulting in delayed wound healing. Moreover, smoking reduces the defense function of the respiratory tract, which may cause respiratory tract infections, followed by coughing, and when coughing intensely, it may cause blood vessel rupture in the thyroid area, leading to the formation of local hematoma. In addition, smoking is also an independent risk factor for atherosclerosis, accelerating the process of atherosclerosis, which can lead to cardiovascular and cerebrovascular diseases, and also increase the risk of lung cancer, bladder cancer and other diseases. Post-thyroid surgery patients should maintain a healthy lifestyle, refrain from smoking, and cooperate with their doctors for active treatment.