Tummy tuvk with lipo
In order for your body to have the best chance for healing, it is recommended that you cease smoking several weeks before surgery. This includes marijuana as there is a chance that the smoke will inhibit your healing potential. The effects of cigarette smoking have been well documented in the medical literature, however marijuana use is less studied. Thus conclusive data does not exist to my knowledge regarding marijuana use and wound healing.
Marijuana smoke does contain carbon monoxide which decreases the ability of red blood cells to release oxygen to tissues. You should stop at least two weeks before and two weeks after. Further, there are potential negative interactions with anesthetic medications as well as narcotics. It is safest to stop before surgery. All the best.