Does marijuana have a negative effect on wound healing?

Less likely. Without the nicotine, its action is apparently less detrimental on the wound healing, but may severely affect the compliance of the individual and affect the proper selfcare.
Possibly. « previousnext »gastroenterology volume 129, issue 2 , pages 437-453, august 2005 differential expression of cannabinoid receptors in the human colon: cannabinoids promote epithelial wound healing however, much more work needs to be done to sort this all out. There are so many chemicals in marijuana and the cannabinoid receptors' roles in the human body are not all calrified yet.