How Long Should One Stop Smoking Before a Brow Lift?

The textbook answer is 2-3 weeks before and 2-3 weeks after.  In reality the brow/forehead has a much better blood supply than the face and the risk of complications in smokers is much higher with a face/neck lift than with a brow/forehead lift.

It is best to not be smoking 2 weeks before and 2 weeks after a brow lift operation.  Smoking causes vasoconstriction of blood vessels from the nicotine and smokers have a higher carbon monoxide component in their blood stream.  Both of these lead to significant healing issues after elective cosmetic surgery.  

The quick answer is at least 2 weeks.   The longer the wait time, the quicker the healing can be.  The same is true for smoking after surgery.  There are different types of brow lifting technique, with somewhat differnt healing periods.