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What are the risks of a kidney transplant if the donor smokes marijuana? - kidney transplant donor

We have just learned that my brother smokes pot and should give a kidney to our mother, who is on dialysis 3 times a week. What are the risks in a situation like this? We are asking hospitals for surgery. I am very concerned that I decided to ask here and see what we got to wait until tomorrow to learn.
Thank you in advance.