Your drainage near the belly button is from a retained suture
Your drainage near the belly button is from a retained permanent suture; until this suture is trimmed, your drainage will continue; you should also get a culture to dictate choice of antibiotics that you should take until healing complete.
Chronic Seroma Or Infected Suture
Smoking pot has nothing to do with it. You've probably had a fluid collection all along since the surgery, as it is likely a complication of that surgery. It's not your fault, and it's not necessarily the surgeons fault either, but you should look for a new doctor that will be honest with you. There is no need to lie.
Best of luck!
Draining after a tummy tuck
The source of the draining could be due to a suture (stitch) that is non-absorbable which may have migrated close to the surface of your belly button. You should be examined by your plastic surgeon to be sure for a thorough exam.
At this late date I would be suspicious of some foreign body like a permanent stitch present there. Your doctor would know if there is one present or not. Dissovable sutures would be long gone. Pleae check on this because if there is a permanent type of suture, you will need it removed. It is safe now to do that. Good luck.