Smoking can 1. Pull the blood clot out by creating a negative vacuum which can delay healing and/or cause painful healing such as a dry socket. 2. It decreases blood supply which is needed for proper/timely healing 3. It decreases oxygen to the healing site which is also needed for proper/timely healing.
Hope this helps!
Andrew Adly, DDS
Hope the oral surgery helps you out well. Smoking slows the body's ability to heal. If you are having teeth extracted at the same time, smoking afterwards puts you at risk of having dry socket. Dragging on a cigarette causes a pressure change in your mouth which could dislodge the blood clot after an extraction. Hope this helps.
Best of luck to you!
William F. Scott IV, DMD