Hello Evergreenkid,
I felt compelled to answer your post because it is one that requires the experience of seeing and treating thousands of gyne patients. Essentially, your question is "what are the chances of my gyne coming back if I quit smoking pot only a short time ago." You also stated that your gyne started in puberty and is located primarily in your nipples (which I equate to a puffy nipple component). Having started in puberty predates the pot smoking (I assume) therefore I am not sure of the relationship of pot to your gyne. The bottom line is your results will depend on how well your surgeon removes your breast capsule. The breast capsule is what contains all your breast tissue. With puffy nipple, this breast tissue acts like it has tentacles that invade into the nipple areola complex.
I have treated many gyne patients who acquired their gyne from steroids. Steroids have a much stronger association with gyne than pot does. Many of these patients continue using steroids (which I don't recommend) and not one has had a return of their gyne. The reason is that when the entire breast capsule is removed, all the breast tissue and precursors to breast tissue are also removed. This makes it impossible for breast tissue to reform to any detectable amount. The same applies to pot. If the entire breast capsule is removed you will not have a recurrence.
The biggest problem you will have is that puffy nipple, as I mentioned, implies invasion of breast tissue into the dermis of the nipple/areola. Inexperienced gyne surgeons have a very difficult time assessing how much of this invasive breast tissue to remove. This takes experience. Taking too little means persistent puffiness. Taking too much may mean loss or partial loss of the nipple/areola complex.
The good news is that you will achieve good, long term results provided you go to an experienced gyne surgeon. Do not worry about the pot smoking. Quitting before surgery is more important from a wound healing perspective. I will save you the discussing the many other, non-gyne, problems of chronic pot smoking as I am sure you are aware.
Enjoy your new gyne free chest,
Dr. Cruise