Can smoking marijuana 2 days after a sleeve gastronomy/bypass be harmful or deadly to the person?

One of the main effects of smoking is affecting the blood flow/supply to the surgical sites that need to heal. With reduced blood flow, healing is impaired and your overall risk of complications increases.

Hope this find you well.
Although there are no studies that make a direct comparison between the use of marijuana and VGS, there are studies that show that smoking has been linked to poor recovery of post-operative wounds due to reduced blood flow at the capillary level that does not allow adequate circulation and oxygenation of the tissue to heal properly, This makes the tissue prone to poor healing and possible infections.