There are several reasons why you can’t smoke after Achilles tendon surgery: First, the skin in the Achilles tendon area is very special because it is protected by external fixation with a brace after the surgery, and the skin itself is squeezed more obviously, and the blood circulation is affected. Smoking will lead to capillary constriction all over the body, which further affects the blood circulation in the area, and may lead to slow healing of the skin in the area, or even no healing, and eventually wound infection will occur. This may lead to slow healing of the skin, or even non-healing of the skin, and eventually infection of the wound. Secondly, the blood circulation in the Achilles tendon area is relatively fragile, coupled with the underlying injury, adequate blood circulation is needed to promote the healing of the Achilles tendon injury area, smoking will also affect the blood circulation in the area, resulting in slow healing of the Achilles tendon. Therefore, it is not recommended to smoke when having this kind of surgery, especially in the early stage of the disease which will be treated with certain medications, even smoking will affect the efficacy of the medications.